名词
中文翻译：子环
同义词：
['subcircuit', 'subcircuitry', 'secondary loop', 'secondary circuit']
例句：
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1. Thesub-loop in the circuit board connects to the main power source.
电路板上的子环连接到主电源。
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2. In the design of the circuit, the sub-loop plays a crucial role in reducing noise.
电路设计中，子环在降低噪音方面起着关键作用。
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3. The sub-loop was designed to improve the efficiency of the system.
子环被设计来提高系统的效率。