n.二十一,二十一个所成之一组;二十一点牌戏(一种赌博游戏)
num.二十一
例句:
[ Results] Twenty-one kinds of components were separated and identified.
[结果]共鉴定出21个成分。
Twenty-one years have passed since then.
尔来二十有一年矣。
Twenty-one thousand more people are expected to lose their jobs.
2万1千多员工面临失业。