名词
中文翻译：Unknown
同义词：
['closedloop', 'closed circuit', 'closed system例句：1. The closed chainis a crucial part of the manufacturing process.（这个封闭链是制造过程中至关重要的部分。）']
例句：
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1. The closed chainis a crucial part of the manufacturing process.
这个封闭链是制造过程中至关重要的部分。
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2.The closed chain has been used in manyapplications to improve efficiency.
这个封闭链被用于许多应用中，以提高效率。
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3. Theclosed chain was designed to prevent any unauthorized access.
这个封闭链被设计来防止任何未经授权的访问。