名词
中文翻译：主要参与者
同义词：
['key figure', 'principal actor']
例句：
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1. The movie's director was a key figure in the production.
这部电影的导演是制作过程中的关键人物。
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2. In the election, the candidate with the most votes is often considered the key figure.
在选举中，得票最多的候选人通常被视为关键人物。
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3. The success of the project depended on the cooperation of all the key figures involved.
项目的成功取决于所有参与方的合作。