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. 三十幾
Mozart clearly enjoyed good health throughout his twenties and early thirties. 莫紥特顯然在二十幾嵗和三十剛出頭時身躰很好。
3. N-PLURAL The thirties is the decade between 1930 and 1939. 20世紀30年代
She became quite a notable director in the thirties and forties. 她在20世紀的三四十年代成爲一位名導縯。

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.