名词
中文翻译：内部开关
同义词：
['internal relay', 'internal switchboard例句：1. The internal switch is responsible for controlling the flow of electricity.（内部开关负责控制电力的流动。）']
例句：
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1. The internal switch is responsible for controlling the flow of electricity.
内部开关负责控制电力的流动。
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2. The engineer had to replace the internal switch in the circuit board.
工程师不得不更换电路板上的内部开关。
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3.The internal switch was designed to prevent overheating during operation.
内部开关设计用来在操作过程中防止过热。