中英释义：
重点词汇
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闭合
close; shut; clogging; closed
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开关
switch; on-off; circuit breaker; power switch; on-off switch; disjunctor; switch on; switch off; turn on; turn off
闭合
close; shut; clogging; closed
开关
switch; on-off; circuit breaker; power switch; on-off switch; disjunctor; switch on; switch off; turn on; turn off