名词
中文翻译：封闭中心
同义词：
['closedloop', 'closed circuit']
例句：
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1. The closed center is the heart ofthe system.
封闭中心是系统的心脏。
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2. Theclosed center is responsible for the flow ofinformation.
封闭中心负责信息流动。
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3. The closedcenter prevents the spread of disease.
封闭中心防止疾病传播。