| 1. | The old engine ground and shuddered .
那台陈旧的发动机抖动着发出摩擦的声音。 |
| 2. | Pulley bearings are frictionless .
滑轮轴承是无摩擦的。 |
| 3. | The engine gave forth a grinding noise , then stopped .
发动机发出一阵摩擦的噪音，然后停了下来。 |
| 4. | A great number of methods for measuring friction of yarns and fibers have been described in the literature .
在文献资料中曾经介绍了许多测定纱线和纤维摩擦的方法。 |
| 5. | Figure 2-1 represents a flat, rigid object of arbitrary shape on a level surface having negligible friction .
图21表示一个任意形状的扁平刚体，放置在无摩擦的水平面上。 |
| 6. | The effect of fiber friction within rovings and yarns can be expressed by means of "minimum twist of cohesion" .
粗纱和细纱中纤维摩擦的效用，可以用“最低粘合捻度”表示。 |
| 7. | In the presence of lubricants the effect of the guide material on friction is overshadowed by the lubricants .
当有润滑剂存在的情况下，导纱杆材料对摩擦的影响则为润滑剂所掩益。 |
| 8. | However, as spin speed is increased, the power required to overcome windage and bearing friction rises sharply .
但是，随着自转角速度的增加，克服风阻和轴承摩擦的功率急剧地提高。 |
| 9. | Figure 7－13(a) shows a man standing on frictionless roller skates on a level surface, facing a rigid wall .
图713（a）表示一个人穿着无摩擦的有轮滑冰鞋站在水平平面上，面对着一堵坚硬的墙。 |
