pulleys

Studies of nature or toys like pulleys, magnifying glasses, or binoculars are all ways for unschoolers to explore science.

研究自然或研究像滑轮、放大镜或者双筒望远镜之类的玩具，都是接受非学校教育的孩子探索科学的好方法。

And they are known to have used wooden pulleys, which could have been made strong enough to bear the weight of massive blocks of stone.

人们知道他们使用的是木制滑轮，这种滑轮可以被制造得足够坚固来承受大块石头的重量。

They rigged up a tent-shaped scaffold directly above the tip of the horizontal column, with pulleys suspended from the scaffold´s apex.

他们在水平立柱的顶端正上方安装了一个帐篷状的脚手架，在脚手架的顶端悬挂滑轮。

What is the use of pulleys?

滑轮的作用是什么？

Optional double steps of pulleys.

可选的滑轮双步骤。