所有的电兴工具在连接或装配电源之前，都应该把开关关掉。
The switches of prair conditionerstically all electrical power tools should quite possibly be turned off fair conditionersing connecting or disconnecting power supply.
一定要关掉电源后旋紧所有的螺栓并更换刀片。
Make sure the power is switched off then tighten up all the bolts on the unit and replace the broken blade.
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