布莱克一家三十年前结婚了。

The Blacks got married thirty years ago.

他又高又瘦，一头金发。他大约三十岁。

He's tall and thin with blonde hair. He's about thirty years old.

他希望在大约二十或三十年内，海洋中没有塑料。

He hopes that the oceans will be free of plastic in about twenty or thirty years.

八点，到了新闻时间。吉姆在十点三十分时完成了他的工作。

At eight it's time for the news, Jim finishes his work at ten thirty.

然而已知最大的木制教堂是在十二世纪三十年代以后建造的。

However the largest known wooden churches were built from the 1130s onwards.

法律规定候选人必须年满三十岁。

The law stipulates/provides that candidates shall be over the age of thirty.

把毛线在染液中浸泡三十分钟。

Immerse the knitting wool in the dye for half an hour.

三十出头的男子精力最为旺盛。

A man in his early thirties enjoys his prime vigour.

这项工程估计要拆迁三十万户居民。

The project is estimated to involve the resettlement of 300,000 households.

快三十的人了，也该找对象了。

You’re nearly thirty and it’s high time you began looking out for a spouse.