twenty-one
twenty-one — 名詞
1. the number that comes after twenty and before twenty-two, written in digits as 2
二十一
介於20與22之間的整數
the number that comes after twenty and before twenty-two, written in digits as 21
Mei turned twenty-one last week and celebrated with her family at a restaurant.
Mei 上週滿二十一歲，和家人一起在餐廳慶祝。
The teacher asked the class to count from one to twenty-one out loud.
老師要求全班大聲從一數到二十一。
counting sequence: from X to Y
There are twenty-one students in Tariq's English class this semester.
Tariq 的英文班上這學期有二十一名學生。
Constanza wrote the number twenty-one on the board and drew a circle around it.
Constanza 在黑板上寫下數字二十一，並在上面畫了一個圓圈。
Ezra solved the maths problem and found that twenty-one was the answer.
Ezra 解出了數學題，發現答案是二十一。
- 21
the Arabic numeral form of the same number
用法筆記
Twenty-one is written with a hyphen between 'twenty' and 'one'. It can be used as a determiner before a plural noun (twenty-one students) or alone as a number.
常見錯誤
2. a card game in which each player tries to get card values adding up to 21, or cl
二十一點
紙牌遊戲，也稱黑傑克
a card game in which each player tries to get card values adding up to 21, or close to it, without going over, and to have a higher total than the dealer
Abigail learned to play twenty-one from her grandmother during the summer break.
Abigail 在暑假期間跟祖母學會了玩二十一點。
A group of friends played twenty-one with a worn deck of cards at the party.
一群朋友在派對上用一副舊撲克牌玩二十一點。
collocation: play twenty-one
Tariq won three rounds of twenty-one in a row and everyone at the table cheered.
Tariq 連續贏了三局二十一點，桌邊的每個人都歡呼起來。
Lakshmi explained the rules of twenty-one to the new players before the game began.
Lakshmi 在遊戲開始前向新玩家解釋二十一點的規則。
The casino table for twenty-one had five people sitting around it, trying their luck.
賭場的二十一點牌桌坐了五個人，大家都想試試運氣。
用法筆記
This card game is also widely called 'blackjack', especially in casinos and in North America. 'Twenty-one' is more common in informal, social settings outside casinos.