For example, you could make a physical door or a crane with a swinging chain.
比如，你可以制作一扇逼真的门或者是一台有摆动链条的吊机。
2
Chain blocks, crane - use electrical saddles, crane - use manual saddles, jib cranes, railroad maintenance equipment.
链动滑轮，吊车专用电动滑板，吊车专用手动滑板，悬臂起重机，铁路养路器械。
3
In this article, the author describes briefly about the Structure, performance and distinguishing features of Ex chain block and Ex hand operated crane carriage.