Water lily plants are key group on study of the flowering plant phylogeny.

睡莲类植物是目前植物分子系统学与进化研究的一个重要类群。

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Scientists have pinpointed a key group of cells that sends itch-alerts to the brain.

科学家们已经明确找到将抓痒提醒信号传输到大脑的一组关键细胞。

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By searching a key word or taking a photo, people can immediately find out which group their waste belongs to.

通过搜索关键词或是拍照，人们立刻就能知道该垃圾属于哪一类。

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They will also meet Zambia away in a potentially key group match in October.

BBC: Parreira takes charge of SA

The key group to watch seems to be the crossbenchers - the non-party independent peers.

BBC: Voting with the heart - and stomach

The key group variable is the type of solidarity in the sociological sense.

FORBES: The Fundamental 2x2 of Capitalism