I twisted three ropes together into one, so it was like thick cord.

我把三根绳子拧成一根，这样它就像粗绳。

As you twist the rope, the bucket starts to spin.

当您扭动绳索时，水桶开始旋转。

Studying mechanical principles, da Vinci designed many useful devices, such as this machine for twisting ropes or a crane used to build canals, that greatly improved the efficiency of Renaissance craftsmen.

达芬奇通过研究机械原理，设计出如用来捻绳的机器或挖掘沟渠的起重机等许多非常有用的设备，极大地提升了文艺复兴时期工匠的工作效率。