block pulley

• 滑轮组；神仙葫芦

block pulley的用法和样例：

例句

1. Crevasse rescue is one of the more complicated mountaineering techniques, sometimes requiring pulley systems and multiple haul lines.
   裂缝救援是一项更副复杂一些的登山技术，有时候需要滑轮组和多组拖曳绳。