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| 81. | The velocity of the center of mass is constant in the absence of external forces. |
| 在无外力时，质心的速度是常量。 |
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| 82. | Scale the fish before cooking them. |
| 烧鱼之前先去掉鱼鳞。 |
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| 83. | These ugly billboards have to go! These luxuries all had to go under the Khmer Rouge. |
| 这些难看的广告牌必须去掉！ |
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| 84. | The external forces include reactions (R)as well as applied loads(P). |
| 外力包括反力R和施加力荷载P。 |
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| 85. | It's not easy to leach out the black colour |
| 将那黑色去掉是不容易的。 |
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| 86. | cause(sth)to move sharply or quickly,often by force |
| 使（某物）猛然或迅速移动（常指靠外力） |
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| 87. | An outside agent exerts a force P of sufficient magnitude causes to spring to stretch. |
| 施足够大的外力P，使弹簧拉长。 |
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| 88. | Mass flow occurs as a result of external forces. |
| 质体流动的发生是由于外力的结果。 |
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| 89. | At equilibrium the resultant of all external forces vanish. |
| 在平衡时，所有外力的合力为零。 |
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| 90. | the rate of change of momentum is proportional to the imposed force and goes in the direction of the force. |
| 物体的加速度跟物体所受的外力成正比，跟物体的质量成反比，加速度的方向跟外力的方向相同。 |
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