I laid the coil spring on the side of his head and he stumbled forward.

我把螺旋弹簧放在他脑袋的一侧， 他跌跌撞撞地向前走去。

B.A small spring in the centre causes the toy inside to bounce out with a twisting movement. The spring coils back down easily enough so that the toy can fit back into the box.

B.中间的小弹簧使里面的玩具扭动弹开。弹簧圈很容易回缩，这样玩具就可以放回盒子里了。