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飞机在大约三万英尺的高度水平飞行。

The aircraft levelled out at about 30,000 feet.

《柯林斯英汉双解大词典》

那辆车花了整整三万。

The car cost a cool thirty thousand.

《牛津词典》

You've got 1,500 Americans, several of whom leave accounts of the whole thing, 40,000 Belgians, 30,000 Swiss and 5,000 English.

避难的人中包括一千五百个美国人,其中也没几个人重视这场战争,四万比利时人,三万瑞士人和五千英国人

耶鲁公开课 - 1871年后的法国课程节选

On the 30th day, I will give you another 1000 dollars-- you'll have a total of 30000 dollars from me.

在第30天，我再给你一千美元-,你将从我这里一共得到三万美元。

哈佛公开课 - 幸福课课程节选

If we looked at all 30000, genes that were important in each individual how do you pick out which ones are important for a particular disease?

如果我们检查人体中,所有三万个至关重要的基因,要怎样从中找出,导致某种疾病的特定基因呢

耶鲁公开课 - 生物医学工程探索课程节选