| 词汇 | twenty |
| 词根词缀 | 词源： O.E. twentig "group of twenty," from twegen "two" (see two) + -tig "group of ten" (see -ty (1)). Cognate with O.Fris. twintich, Du. twintig, O.H.G. zweinzug, Ger. zwanzig. Goth. twai tigjus is even more transparent: lit. "two tens." Twentieth is O.E. twentigoða. The card game twenty-one (1790) is from Fr. vingt-et-un (1781). Twenty-twenty hindsight is first recorded 1962, a fig. use of the Snellen fraction for normal visual acuity, expressed in feet. The guessing game of twenty questions is recorded from 1786. The Twentieth Century Limited was an express train from New York to Chicago 1902-1967. 词根记忆： num.二十pron./a.二十(个,只…)His room is twenty square metres.他的房间有二十个平方米. |
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