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The fuse will automatically go before a short circuit can do much harm.
在短路能造成很大危害之前，保险丝能够自动熔断。
youdao
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When the switch is off, the circuit is open and electricity doesn't go through.
开关断开时，电路开路，电流不能流过。
youdao
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When the switch is off, the circuit is open and electricity doesn't go through.
开关断开时，电路开路，电流不能流过。
youdao