短语词组短语rope -pulley E hoist 索滑轮提升机rope round pulley 绕绳滑轮;导绳器;绕绳轮轴rope and pulley type 绳索滑轮式rope to pulley ratio 绳径;轮径比Dynamic rope for pulley block 滑轮组跑绳rope pulley flywheel 绳索飞轮 返回 rope pulley