You must turn off the switch when anything goes wrong with the motor.
如果电动机有什么毛病时，你必须关掉开关。
You must turn off the switch when things goes wrong with the motor.
假若电念头有什么毛病时，你必需关掉开关。
You must turn off the switch when by any means goes wrong with the motor.
要是电念头有什么毛病时，你必须关掉开关。
You must turn off the switch when by any means goes wrong with the motor.
要是电念头有什么毛病时，你必须关掉开关。
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