滑轮

huá lún zǔ shì shén me ne

滑轮组是什么呢？

What is a pulley block?

dòng huá lún yǒu hěn duō zhǒng lèi xíng

动滑轮有很多种类型。

There are many types of movable pulley.

zhòng wù tōng guò lǎn shéng hé huá lún xì tǒng yùn sòng

重物通过缆绳和滑轮系统运送。

The weights are moved via a cable and pulley system.