重要的是要在最后一个螺母上安装一个防松垫圈，否则它会逐渐变松。

It's important to put a lock washer on that last nut, or it can work loose.

《柯林斯英汉双解大词典》

您是否曾经用过锤子和螺丝刀从螺栓上拧下螺母？

Have you ever used a hammer and screwdriver to loosen a nut from a bolt?

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放下锤子和螺丝刀，将套筒扳手放到螺母上拧动。

Put down the hammer and screwdriver, and place the socket over the nut and turn.

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