你要更换刀具或给电动工具换位之前，都要切断电源。
Whenever you need to change a blade or bit on a power tool, always disconnect the electricity to the power tool before even beginning the blade change.
你要更换刀具或给电动工具换位之前，都要切断电源。
Whenever you need to change a blade or bit on a power tool, always disconnect the electricity to the power tool before even beginning the blade change.
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