To do a jumping jack you have to stand still, keeping your feet together and your arms by your sides.

开合跳需要你垂直站立，双臂下垂。

You take off the tire, put on the spare, put the lugs back, tighten them, lower the jack, you're good to go.

你取下轮胎， 装上备用轮胎， 将凸耳放回原处， 拧紧它们，放下千斤顶，你就可以走了。