1
a human action
不定冠词a表示泛指一种行为。
Laughing is a human action.
笑是一种人类行动。
人类行动；人所做的事情
先理解核心含义，再看它在真实句子里的用法。
人类行动；人所做的事情
something done by a person; an act performed by a human being
Laughing is a human action.
笑是一种人类行动。
常用于哲学、社会学或法律语境
Understanding human action is key to sociology.
理解人类行动是社会学关键。
The disaster was caused by human action.
这场灾难是由人类行动引起的。
Climate change is largely a result of human action.
气候变化很大程度上是人类行动的结果。
不定冠词a表示泛指一种行为。
Laughing is a human action.
笑是一种人类行动。
human action作为主语，后接动词。
Human action can be studied.
人类行动可以被研究。
human action作为宾语。
We observed a human action.
我们观察了一种人类行动。
介词短语，表示“在人类行动中”。
There is meaning in human action.
人类行动中有意义。
Not this
The human action is the subject of this study.
Use this
Human action is the subject of this study.
中文中可以说'人类行动'而不加冠词，但英语中当'human action'作为泛指概念时，不需要用定冠词'the'。
Not this
Human actions are a fascinating topic.
Use this
Human action is a fascinating topic.
当谈论作为学科或一般概念的人类行动时，'human action'应为不可数名词，用单数形式；'actions'指具体行为，用复数时谓语动词应为复数，但此处语境为泛指，所以应用单数。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
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常作学术用语，既指具体行为（可数）也指抽象概念（不可数）
Dictionary facts from ECDICT.