名词
中文翻译：关键人物
同义词：
['key figure', 'key player']
例句：
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1.The key man in this project is the person who will make all the decisions.
这个项目的关键人物是做出所有决定的人。
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2. The key man was a man who had been working for the company for many years.
这个关键人物是一个在公司工作了很多年的男士。
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3.The key man of the team was responsible for leading the project.
团队的关键人物负责领导项目。