白天我在牧场看护家群，晚上我看家。

In the daytime, I watch out for the cattle in the meadows;

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一群艺术家也会尝试把垃圾变成艺术品。

A group of artists will also try to turn the rubbish into art works.

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一群艺术家在科罗拉多南部建立了名为“堕落城市”的公社。

A group of artists founded a commune in southern Colorado called "Drop City".

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Through many decades of study, biologists have teased out certain populations of cells within the bone marrow that are capable of reproducing subsets of cells.

经过数十年的研究,生物学家们在骨髓中发现了,一些细胞群,它们能够生成细胞亚群

耶鲁公开课 - 生物医学工程探索课程节选

What they cared about-- because the Roman Republic by this time was basically a bunch of very important households, wealthy men and their households, and they were the members of the Senate, they were the knight class, they were the people who ran Rome.

他们在乎的是。。。因为当时的罗马共和国,实际上就是一群举足轻重的家户，富有男子及其家户所组成，他们是元老院成员，是骑士阶级，罗马的统治者。

耶鲁公开课 - 新约课程节选