pulley
noun [ C ] uk/ˈpʊl.i/ us/ˈpʊl.i/
（用于搬运重物的）滑车，滑轮
a piece of equipment for moving heavy objects up or down, consisting of a small wheel over which a rope or chain attached to the object can be easily raised or lowered
The blocks of stone had to be lifted into position with a system of pulleys. 这些石块得用滑轮组牵引到位。