1. A pulley or a system of pulleys set in a casing. 
   滑轮，滑轮组安装在机械外壳中的滑轮或滑轮组
2. Levers and pulleys are simple machines. 
   杠杆和滑轮是简单机械。
3. The rope and pulley has been already put together. 
   绳索与滑轮早已装配好了。
4. a block that can be opened to receive the bight of a rope. 
   打开后能够获得绳的曲线的滑轮。
5. A hoist consisting of a single rope passing through an overhead pulley. 
   小滑轮吊车由一单根的穿过高空滑轮的绳子组成的吊升装置

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