把一段绳子绕在柱上，或绕在棒子上，可以利用绳子，和柱子间的摩擦力，达到我们想要的，它是如此运作的。

You wrap a rope around a pole, or around a rod, and you use the friction between the rope and that rod to your advantage, and it works as follows.

youdao

把一段绳子绕在柱上，或绕在棒子上，可以利用绳子，和柱子间的摩擦力，达到我们想要的，它是如此运作的。

You wrap a rope around a pole, or around a rod, and you use the friction between the rope and that rod to your advantage, and it works as follows.

youdao