类群之间的差异和每个类群内部的相似性使大多数生物学家确信，生命之树只有两个树干。

The differences between the groups and the similarities within each group made it seem certain to most biologists that the tree of life had only two stems.

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就像克隆人之间的相似性一样，猎豹这一物种的同质性使它们特别容易受到疾病的伤害。

Almost like clones in their similarity to one another, the cheetah species' homogeneity makes them especially vulnerable to disease.

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他们两人的相似之处，使我们这些七年前曾看着凯利向另一个委员会提供证据的人，感到不安、难受。

For those of us who, seven years ago, watched Kelly give evidence to another committee, the resemblance was disturbing and painful.

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Because of that, in order to efficient function, then you group all the like activities together.

所以,为了使各种生理功能更加高效化,你就得把各种相似的生命活动分在一起

耶鲁公开课 - 生物医学工程探索课程节选