The nuts weren't properly tightened and the wheel came off.

螺母没拧紧，轮子脱落了。

《牛津词典》

First loosen the nuts, then take off the wheel.

先松开螺母，然后卸下车轮。

youdao

Beneath the hand wheel are two nuts attached to the valve body.

在手轮下面是两个附在阀体上的螺母。

youdao

Beneath the hand wheel are two nuts attached to the valve body.

在手轮下面是两个附在阀体上的螺母。

youdao