他捐了一个肾来挽救朋友的生命。

He donated a kidney to save his friend's life.

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He donated a kidney to save his friend's life.

kidney 是名词,指"肾脏",人体内负责过滤血液、排出废物的重要器官。人体通常有两个肾脏,位于腰部两侧。

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