名词
中文翻译：关键发送者
同义词：
['key player', 'key contributor']
例句：
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1. The key sender of the project is responsible for ensuring that all tasks are completed on time.
该项目的关键发送者负责确保所有任务按时完成。
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2. The key sender of the message was able to identify the problem and provide a solution.
消息的关键发送者能够识别问题并提供解决方案。
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3. The key sender of the report was able to provide valuable insights into the company's performance.
报告的关键发送者能够提供有关公司表现的宝贵见解。