thirty

thirty
(pl. -ies)

the number equivalent to the product of three and ten; ten less than forty; 30(Roman numeral: xxx or XXX.)
三十；三十个(罗马数字：xxx 或 XXX.)
thirty or forty years ago.
三四十年前。
thirty were hurt.
有30人受伤。
thirty of her school friends.
她的30位校友。
■(thirties)the numbers from thirty to thirty-nine, especially the years of a century or of a person's life
三十几；三十多年代；三十几岁
a woman in her thirties.
一个三十多岁的女人。
she was a famous actress in the thirties.
她是30年代的著名演员。
■thirty years old
三十岁
I've got a long way to go before I'm thirty.
我离30岁还早着呢。
■thirty miles an hour
时速三十英里
doing about thirty.
开车时速约30英里。
■a size of garment or other merchandise denoted by thirty
（衣服等商品的）三十号

派生
thirtieth
ordinal number
thirtyfold
( & )
adjective& adverb
语源

Old English thrītig (see three, -ty). The spelling with initial thi- is recorded in literature in the 15th cent., and has been the prevalent form since the 16th cent

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