Markdown语法和表情

# 一级标题
## 二级标题
### 三级标题

我展示的是一级标题
=================
我展示的是二级标题
-----------------

*斜体文本*
_斜体文本_
**粗体文本**
__粗体文本__
***粗斜体文本***
___粗斜体文本___

***
* * *
*****
- - -
----------

删除线
~~删除线~~

<u>带下划线文本</u>

> 这是一段引用的文本。

> 最外层
> > 第一层嵌套
> > > 第二层嵌套

- 无序列表项1
- 无序列表项2
1. 有序列表项1
2. 有序列表项2

1. 第一项：
    - 第一项嵌套的第一个元素
    - 第一项嵌套的第二个元素
2. 第二项：
    - 第二项嵌套的第一个元素
    - 第二项嵌套的第二个元素

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![alt 属性文本](图片地址)
![alt 属性文本](图片地址 "可选标题")

`printf()` 函数

> ```python def hello():
>     print("Hello, world!")
> ```
def hello():
    print("Hello, world!")

|  表头   | 表头  |
|  ----  | ----  |
| 单元格  | 单元格 |
| 单元格  | 单元格 |

| 左对齐 | 右对齐 | 居中对齐 |
| :-----| ----: | :----: |
| 单元格 | 单元格 | 单元格 |
| 单元格 | 单元格 | 单元格 |

使用 <kbd>Ctrl</kbd>+<kbd>Alt</kbd>+<kbd>Del</kbd> 重启电脑

**文本加粗** 
\*\* 正常显示星号 \*\*

\   反斜线
`   反引号
*   星号
_   下划线
{}  花括号
[]  方括号
()  小括号
#   井字号
+   加号
-   减号
.   英文句点
!   感叹号

$$
\begin{Bmatrix}
   a & b \\
   c & d
\end{Bmatrix}
$$
$$
\begin{CD}
   A @>a>> B \\
@VbVV @AAcA \\
   C @= D
\end{CD}
$$

> :clap: 高考数学144；全国大学生数学竞赛一等奖（预赛）；华为杯中国研究生数学建模竞赛一等奖。

:smile:   :laughing:
  :blush:   :smiley:  ☺️ :relaxed:
  :smirk:   :heart_eyes:    :kissing_heart:
  :kissing_closed_eyes:   :flushed:   :relieved:
  :satisfied:   :grin:    :wink:
  :stuck_out_tongue_winking_eye:    :stuck_out_tongue_closed_eyes:    :grinning:
  :kissing:   :kissing_smiling_eyes:    :stuck_out_tongue:
  :sleeping:    :worried:   :frowning:
  :anguished:   :open_mouth:    :grimacing:
  :confused:    :hushed:    :expressionless:
  :unamused:    :sweat_smile:   :sweat:
  :disappointed_relieved:   :weary:   :pensive:
  :disappointed:    :confounded:    :fearful:
  :cold_sweat:    :persevere:   :cry:
  :sob:   :joy:   :astonished:
  :scream:  :neckbeard: :neckbeard:   :tired_face:
  :angry:   :rage:    :triumph:
  :sleepy:    :yum:   :mask:
  :sunglasses:    :dizzy_face:    :imp:
  :smiling_imp:   :neutral_face:    :no_mouth:
  :innocent:    :alien:   :yellow_heart:
  :blue_heart:    :purple_heart:  ❤️ :heart:
  :green_heart:   :broken_heart:    :heartbeat:
  :heartpulse:    :two_hearts:    :revolving_hearts:
  :cupid:   :sparkling_heart: ✨ :sparkles:
⭐ :star:    :star2:   :dizzy:
  :boom:    :collision:   :anger:
❗ :exclamation: ❓ :question:  ❕ :grey_exclamation:
❔ :grey_question:   :zzz:   :dash:
  :sweat_drops:   :notes:   :musical_note:
  :fire:    :hankey:    :poop:
  :shit:    :+1:    :thumbsup:
  :-1:    :thumbsdown:    :ok_hand:
  :punch:   :facepunch: ✊ :fist:
✌️ :v:    :wave:  ✋ :hand:
✋ :raised_hand:   :open_hands:  ☝️ :point_up:
  :point_down:    :point_left:    :point_right:
  :raised_hands:    :pray:    :point_up_2:
  :clap:    :muscle:    :metal:
  :fu:    :walking:   :runner:
  :running:   :couple:    :family:  :two_men_holding_hands: 
  :two_women_holding_hands: 
  :dancer:  :dancers:  ‍♀️ :ok_woman:   :no_good:
  :information_desk_person:   :raising_hand:   ‍♀️ :bride_with_veil:
:person_with_pouting_face: :person_with_pouting_face: :person_frowning: :person_frowning:   :bow:
  :couplekiss:    :couple_with_heart:   :massage:
  :haircut:   :nail_care:   :boy:
  :girl:    :woman:   :man:
  :baby:    :older_woman:   :older_man:
  :man_with_gua_pi_mao:  ‍♂️ :man_with_turban:
  :construction_worker:   :cop:   :angel:
  :princess:    :smiley_cat:    :smile_cat:
  :heart_eyes_cat:    :kissing_cat:   :smirk_cat:
  :scream_cat:    :crying_cat_face:   :joy_cat:
  :pouting_cat:   :japanese_ogre:   :japanese_goblin:
  :see_no_evil:   :hear_no_evil:    :speak_no_evil:
 ‍♂️ :guardsman:    :skull:   :feet:
  :lips:    :kiss:    :droplet:
  :ear:   :eyes:    :nose:
  :tongue:    :love_letter:   :bust_in_silhouette:
  :busts_in_silhouette:   :speech_balloon:    :thought_balloon:
☀️ :sunny:  ☔ :umbrella:  ☁️ :cloud:
❄️ :snowflake:  ⛄ :snowman: ⚡ :zap:
  :cyclone:   :foggy:   :ocean:
  :cat:   :dog:   :mouse:
  :hamster:   :rabbit:    :wolf:
  :frog:    :tiger:   :koala:
  :bear:    :pig:   :pig_nose:
  :cow:   :boar:    :monkey_face:
  :monkey:    :horse:   :racehorse:
  :camel:   :sheep:   :elephant:
  :panda_face:    :snake:   :bird:
  :baby_chick:    :hatched_chick:   :hatching_chick:
  :chicken:   :penguin:   :turtle:
  :bug:   :honeybee:    :ant:
  :beetle:    :snail:   :octopus:
  :tropical_fish:   :fish:    :whale:
  :whale2:    :dolphin:   :cow2:
  :ram:   :rat:   :water_buffalo:
  :tiger2:    :rabbit2:   :dragon:
  :goat:    :rooster:   :dog2:
  :pig2:    :mouse2:    :ox:
  :dragon_face:   :blowfish:    :crocodile:
  :dromedary_camel:   :leopard:   :cat2:
  :poodle:    :paw_prints:    :bouquet:
  :cherry_blossom:    :tulip:   :four_leaf_clover:
  :rose:    :sunflower:   :hibiscus:
  :maple_leaf:    :leaves:    :fallen_leaf:
  :herb:    :mushroom:    :cactus:
  :palm_tree:   :evergreen_tree:    :deciduous_tree:
  :chestnut:    :seedling:    :blossom:
  :ear_of_rice:   :shell:   :globe_with_meridians:
  :sun_with_face:   :full_moon_with_face:   :new_moon_with_face:
  :new_moon:    :waxing_crescent_moon:    :first_quarter_moon:
  :waxing_gibbous_moon:   :full_moon:   :waning_gibbous_moon:
  :last_quarter_moon:   :waning_crescent_moon:    :last_quarter_moon_with_face:
  :first_quarter_moon_with_face:    :moon:    :earth_africa:
  :earth_americas:    :earth_asia:    :volcano:
  :milky_way: ⛅ :partly_sunny:  :octocat: :octocat:
  :bamboo:    :gift_heart:    :dolls:
  :school_satchel:    :mortar_board:    :flags:
  :fireworks:   :sparkler:    :wind_chime:
  :rice_scene:    :jack_o_lantern:    :ghost:
  :santa:   :christmas_tree:    :gift:
  :bell:    :no_bell:   :tanabata_tree:
  :tada:    :confetti_ball:   :balloon:
  :crystal_ball:    :cd:    :dvd:
  :floppy_disk:   :camera:    :video_camera:
  :movie_camera:    :computer:    :tv:
  :iphone:  ☎️ :phone:  ☎️ :telephone:
  :telephone_receiver:    :pager:   :fax:
  :minidisc:    :vhs:   :sound:
  :speaker:   :mute:    :loudspeaker:
  :mega:  ⌛ :hourglass: ⏳ :hourglass_flowing_sand:
⏰ :alarm_clock: ⌚ :watch:   :radio:
  :satellite: ➿ :loop:    :mag:
  :mag_right:   :unlock:    :lock:
  :lock_with_ink_pen:   :closed_lock_with_key:    :key:
  :bulb:    :flashlight:    :high_brightness:
  :low_brightness:    :electric_plug:   :battery:
  :calling:   :email:   :mailbox:
  :postbox:   :bath:    :bathtub:
  :shower:    :toilet:    :wrench:
  :nut_and_bolt:    :hammer:    :seat:
  :moneybag:    :yen:   :dollar:
  :pound:   :euro:    :credit_card:
  :money_with_wings:    :e-mail:    :inbox_tray:
  :outbox_tray: ✉️ :envelope:   :incoming_envelope:
  :postal_horn:   :mailbox_closed:    :mailbox_with_mail:
  :mailbox_with_no_mail:    :door:    :smoking:
  :bomb:    :gun:   :hocho:
  :pill:    :syringe:   :page_facing_up:
  :page_with_curl:    :bookmark_tabs:   :bar_chart:
  :chart_with_upwards_trend:    :chart_with_downwards_trend:    :scroll:
  :clipboard:   :calendar:    :date:
  :card_index:    :file_folder:   :open_file_folder:
✂️ :scissors:   :pushpin:   :paperclip:
✒️ :black_nib:  ✏️ :pencil2:    :straight_ruler:
  :triangular_ruler:    :closed_book:   :green_book:
  :blue_book:   :orange_book:   :notebook:
  :notebook_with_decorative_cover:    :ledger:    :books:
  :bookmark:    :name_badge:    :microscope:
  :telescope:   :newspaper:   :football:
  :basketball:  ⚽ :soccer:  ⚾ :baseball:
  :tennis:    :8ball:   :rugby_football:
  :bowling: ⛳ :golf:    :mountain_bicyclist:
  :bicyclist:   :horse_racing:    :snowboarder:
  :swimmer:   :surfer:    :ski:
♠️ :spades: ♥️ :hearts: ♣️ :clubs:
♦️ :diamonds:   :gem:   :ring:
  :trophy:    :musical_score:   :musical_keyboard:
  :violin:    :space_invader:   :video_game:
  :black_joker:   :flower_playing_cards:    :game_die:
  :dart:    :mahjong:   :clapper:
  :memo:    :pencil:    :book:
  :art:   :microphone:    :headphones:
  :trumpet:   :saxophone:   :guitar:
  :shoe:    :sandal:    :high_heel:
  :lipstick:    :boot:    :shirt:
  :tshirt:    :necktie:   :womans_clothes:
  :dress:   :running_shirt_with_sash:   :jeans:
  :kimono:    :bikini:    :ribbon:
  :tophat:    :crown:   :womans_hat:
  :mans_shoe:   :closed_umbrella:   :briefcase:
  :handbag:   :pouch:   :purse:
  :eyeglasses:    :fishing_pole_and_fish: ☕ :coffee:
  :tea:   :sake:    :baby_bottle:
  :beer:    :beers:   :cocktail:
  :tropical_drink:    :wine_glass:    :fork_and_knife:
  :pizza:   :hamburger:   :fries:
  :poultry_leg:   :meat_on_bone:    :spaghetti:
  :curry:   :fried_shrimp:    :bento:
  :sushi:   :fish_cake:   :rice_ball:
  :rice_cracker:    :rice:    :ramen:
  :stew:    :oden:    :dango:
  :egg:   :bread:   :doughnut:
  :custard:   :icecream:    :ice_cream:
  :shaved_ice:    :birthday:    :cake:
  :cookie:    :chocolate_bar:   :candy:
  :lollipop:    :honey_pot:   :apple:
  :green_apple:   :tangerine:   :lemon:
  :cherries:    :grapes:    :watermelon:
  :strawberry:    :peach:   :melon:
  :banana:    :pear:    :pineapple:
  :sweet_potato:    :eggplant:    :tomato:
  :corn:  
1️⃣ :one: 2️⃣ :two: 3️⃣ :three:
4️⃣ :four:  5️⃣ :five:  6️⃣ :six:
7️⃣ :seven: 8️⃣ :eight: 9️⃣ :nine:
  :keycap_ten:    :1234:  0️⃣ :zero:<br/>#️⃣ :hash:   :symbols: ◀️ :arrow_backward:
⬇️ :arrow_down: ▶️ :arrow_forward:  ⬅️ :arrow_left:
  :capital_abcd:    :abcd:    :abc:
↙️ :arrow_lower_left: ↘️ :arrow_lower_right:  ➡️ :arrow_right:
⬆️ :arrow_up: ↖️ :arrow_upper_left: ↗️ :arrow_upper_right:
⏬ :arrow_double_down: ⏫ :arrow_double_up:   :arrow_down_small:
⤵️ :arrow_heading_down: ⤴️ :arrow_heading_up: ↩️ :leftwards_arrow_with_hook:
↪️ :arrow_right_hook: ↔️ :left_right_arrow: ↕️ :arrow_up_down:
  :arrow_up_small:    :arrows_clockwise:    :arrows_counterclockwise:
⏪ :rewind:  ⏩ :fast_forward:  ℹ️ :information_source:
  :ok:    :twisted_rightwards_arrows:   :repeat:
  :repeat_one:    :new:   :top:
  :up:    :cool:    :free:
  :ng:    :cinema:    :koko:
  :signal_strength:   :u5272:   :u5408:
  :u55b6:   :u6307:  ️ :u6708:
  :u6709:   :u6e80:   :u7121:
  :u7533:   :u7a7a:   :u7981:
 ️ :sa:   :restroom:    :mens:
  :womens:    :baby_symbol:   :no_smoking:
 ️ :parking:  ♿ :wheelchair:    :metro:
  :baggage_claim:   :accept:    :wc:
  :potable_water:   :put_litter_in_its_place: ㊙️ :secret:
㊗️ :congratulations:  Ⓜ️ :m:    :passport_control:
  :left_luggage:    :customs:   :ideograph_advantage:
  :cl:    :sos:   :id:
  :no_entry_sign:   :underage:    :no_mobile_phones:
  :do_not_litter:   :non-potable_water:   :no_bicycles:
  :no_pedestrians:    :children_crossing: ⛔ :no_entry:
✳️ :eight_spoked_asterisk:  ✴️ :eight_pointed_black_star:   :heart_decoration:
  :vs:    :vibration_mode:    :mobile_phone_off:
  :chart:   :currency_exchange: ♈ :aries:
♉ :taurus:  ♊ :gemini:  ♋ :cancer:
♌ :leo: ♍ :virgo: ♎ :libra:
♏ :scorpius:  ♐ :sagittarius: ♑ :capricorn:
♒ :aquarius:  ♓ :pisces:  ⛎ :ophiuchus:
  :six_pointed_star:  ❎ :negative_squared_cross_mark:  ️ :a:
 ️ :b:    :ab:   ️ :o2:
  :diamond_shape_with_a_dot_inside: ♻️ :recycle:    :end:
  :on:    :soon:    :clock1:
  :clock130:    :clock10:   :clock1030:
  :clock11:   :clock1130:   :clock12:
  :clock1230:   :clock2:    :clock230:
  :clock3:    :clock330:    :clock4:
  :clock430:    :clock5:    :clock530:
  :clock6:    :clock630:    :clock7:
  :clock730:    :clock8:    :clock830:
  :clock9:    :clock930:    :heavy_dollar_sign:
©️ :copyright:  ®️ :registered: ™️ :tm:
❌ :x: ❗ :heavy_exclamation_mark:  ‼️ :bangbang:
⁉️ :interrobang:  ⭕ :o: ✖️ :heavy_multiplication_x:
➕ :heavy_plus_sign: ➖ :heavy_minus_sign:  ➗ :heavy_division_sign:
  :white_flower:    :100: ✔️ :heavy_check_mark:
☑️ :ballot_box_with_check:    :radio_button:    :link:
➰ :curly_loop:  〰️ :wavy_dash:  〽️ :part_alternation_mark:
  :trident: :black_square: :black_square: 
✅ :white_check_mark:    :black_square_button:
  :white_square_button:
⚫ :black_circle:  ⚪ :white_circle:    :red_circle:
  :large_blue_circle:   :large_blue_diamond:    :large_orange_diamond:
  :small_blue_diamond:    :small_orange_diamond:  
  :small_red_triangle:  :small_red_triangle_down:
  :house:   :house_with_garden:   :school:
  :office:    :post_office:   :hospital:
  :bank:    :convenience_store:   :love_hotel:
  :hotel:   :wedding: ⛪ :church:
  :department_store:    :european_post_office:    :city_sunrise:
  :city_sunset:   :japanese_castle:   :european_castle:
⛺ :tent:    :factory:   :tokyo_tower:
  :japan:   :mount_fuji:    :sunrise_over_mountains:
  :sunrise:   :stars:   :statue_of_liberty:
  :bridge_at_night:   :carousel_horse:    :rainbow:
  :ferris_wheel:  ⛲ :fountain:    :roller_coaster:
  :ship:    :speedboat: ⛵ :boat:
⛵ :sailboat:    :rowboat: ⚓ :anchor:
  :rocket:  ✈️ :airplane:   :helicopter:
  :steam_locomotive:    :tram:    :mountain_railway:
  :bike:    :aerial_tramway:    :suspension_railway:
  :mountain_cableway:   :tractor:   :blue_car:
  :oncoming_automobile:   :car:   :red_car:
  :taxi:    :oncoming_taxi:   :articulated_lorry:
  :bus:   :oncoming_bus:    :rotating_light:
  :police_car:    :oncoming_police_car:   :fire_engine:
  :ambulance:   :minibus:   :truck:
  :train:   :station:   :train2:
  :bullettrain_front:   :bullettrain_side:    :light_rail:
  :monorail:    :railway_car:   :trolleybus:
  :ticket:  ⛽ :fuelpump:    :vertical_traffic_light:
  :traffic_light: ⚠️ :warning:    :construction:
  :beginner:    :atm:   :slot_machine:
  :busstop:   :barber:  ♨️ :hotsprings:
  :checkered_flag:    :crossed_flags:   :izakaya_lantern:
  :moyai:   :circus_tent:   :performing_arts:
  :round_pushpin:   :triangular_flag_on_post:    :jp: