thirty
英 [θti] 美 [θrti]
num.
三十;三十几;三十年代
复数 thirties
例句
The association between the two companies stretches back thirty years.
这两家公司的往来可以追溯到30年前。
I know that you've been studying chimpanzees for thirty years now
我知道你研究黑猩猩至今已有30年了。
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