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human beings
A human being is a man, woman, or child.
The treatment will be tried out on human beings only after it has been shown to be safe and foolproof in animals.
该疗法只有在动物身上证明安全、万无一失后才会在人体上试用。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。