名词
中文翻译：关闭部分
同义词：
['close part', 'closing element例句：1. The engineer carefully closed the door to ensure everything was secure.（工程师小心翼翼地关上了门，确保一切安全。）']
例句：
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1. The engineer carefully closed the door to ensure everything was secure.
工程师小心翼翼地关上了门，确保一切安全。
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2.The project team is working on a closing piece of software to improve efficiency.
项目团队正在开发一个软件的最后部分，以提高效率。
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3.The closing piece of the speech was when he mentioned his plans for the future.
演讲的结尾部分是他提到对未来的计划。