| 11. | He pushed the box very hard down the slope, but friction gradually caused it to slow down and friction gradually caused it to slow down and stop. |
| 他用力把箱子推下山坡，但是摩擦力使箱子的下滑速度逐渐缓慢下来，最后就停住了。
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| 12. | Friction generates heat. |
| 摩擦生热。
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| 13. | When Joan returned to work, the friction between them increased. |
| 琼回来工作后，他们之间的摩擦加剧了。
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| 14. | Constant friction between two brothers led to many arguments and fights. |
| 兄弟俩经常龃龉，导致了多次争吵和斗殴。
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| 15. | Constant friction between the two nations finally caused a war. |
| 两国间的经常性冲突最终引起了战争。
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| 16. | Matches are lighted by friction . |
| 火柴靠摩擦点燃。
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| 17. | Friction against the rock,combined with the weight of the climber,caused his rope to break. |
| 与岩石的摩擦,加上登山者的重量,使他的绳子断了.
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| 18. | If there is friction between people,they do not get on well together. |
| 人们之间若有摩擦.就不会相处得好.
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| 19. | Friction with the air causes damage to planes flying at high speeds. |
| 飞机高速飞行时与空气的摩擦会对飞机产生损害.
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| 20. | But a watch could never repair itself -- it does not consist of living parts, only of metal, which wears away by friction . |
| 但是，手表决不会自行修理，它不是由有生命的部件组成，而是由金属组成，而金属可以随着磨擦而磨损殆尽。
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