| 1. | Pulley bearings are frictionless .
滑轮轴承是无摩擦的。 |
| 2. | In high school we learned a lot of laws about pulleys and levers used in different ways .
在高中我们已学过许多有关不同用途的滑轮和杠杆的定律。 |
| 3. | A wheel turned by or driving a belt
滑轮通过拉一根带子转动或牵拉一根带子的轮子 |
| 4. | Ships ' steel guy blocks with swivels for fibre rope
船用带转环的钢制纤维拉索滑轮 |
| 5. | Cycles . hubs and freewheels . assembly dimensions
自行车.轮毂和游滑轮.组装尺寸 |
| 6. | Ships ' steel cargo blocks with roller bearings
船上吊货用带滚柱轴承的钢制滑轮 |
| 7. | - no , no , man . these are the welfare rollers . -
不，朋友，是几颗接受社会福利的滑轮 |
| 8. | Ships ' cast steel cargo blocks with roller bearings
船上吊货用带滚柱轴承的铸钢滑轮 |
| 9. | Small craft - steering gear - cable and pulley systems
小艇.操舵装置.缆索和滑轮系统 |
| 10. | Construction machinery and equipment . welded pulleys
建筑机械与设备.焊接滑轮 |
