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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使用这种方法节省了大量的时间，这种方法与使用橡皮擦工具或魔术棒工具来选择性切断周围的树木和阴影的方法比起来要更好。

Using this method saves a lot of time and looks better compared to trying to selectively cut out around the trees and shadows using the eraser tool or magic wand tool.

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救援人员表示，他们在试图切断钢条解救一名被困妇女时，工具发出的火星引起了火灾。

A fire broke out at the site when rescuers set off sparks says they try to cut through a steel rod to reach a woman.

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