1 NUM (数字) 30 Thirty is the number 30. (数字) 30
2 N-PLURAL 三十多,三十几(指 30 至 39 之间的数字) 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. 三十多,三十几(指 30 至 39 之间的数字)
3 N-PLURAL 三十年代(指 1930 年至 1939 年) The thirties is the decade between 1930 and 1939. 三十年代(指 1930 年至 1939 年)
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