thirty

柯林斯词典

1. NUM Thirty is the number 30. 30
2. N-PLURAL When you talk about the thirties, you are referring to numbers between 30 and 39. For example, if you are in your thirties, you are aged between 30 and 39. If the temperature is in the thirties, the temperature is between 30 and 39 degrees. 三十几
Mozart clearly enjoyed good health throughout his twenties and early thirties. 莫扎特显然在二十几岁和三十刚出头时身体很好。
3. N-PLURAL The thirties is the decade between 1930 and 1939. 20世纪30年代
She became quite a notable director in the thirties and forties. 她在20世纪的三四十年代成为一位名导演。

There must have been thirty to thirty-five people there.
Every thirty minutes or so the flight attendant would wheel the drinks trolley down the aisle .
He must be about sixty, whereas his wife looks about thirty.
The water is some twenty to thirty metres beneath the ground .
Linda's been in the business for thirty years - she knows what's what.