复数： thirties

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Thirty minutes of sex burns 85 calories or more .

三十分钟的性可以烧掉85卡路里或更多的热量。

These are seventy dollars and those are thirty dollars .

这双是七十元，那双是三十元。

An experimental innovator would go back to haiti thirty times .

一个试验型的创作者会重返海地多达三十次。

But in thirty years , only seven acres have been uncovered .

但是三十年来，仅找遍了七英亩。

Thirty years later , it was covered with trees .

但三十年以后，陆地都被树林所覆盖。