同义词： pulley-block block
以上来源于: WordNet
N-COUNT A pulley is a device consisting of a wheel over which a rope or chain is pulled in order to lift heavy objects. 滑轮
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。
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