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| 31. | It often takes trouble from outside to weld a family together. |
| 要使一个家庭重归于好，往往需要求助于外力。 |
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| 32. | and at the same speed unless it is influenced by a force. |
| 在不受外力影响的情况下作匀速运动。 |
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| -- 来源 -- 综合英语第3册 - Unit 7 Famous Scientists Text A |
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| 33. | 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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| 34. | 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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| 35. | Be sufficient for; be enough for |
| 足够 |
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| 36. | 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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| 37. | 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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| 38. | 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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| 39. | 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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| 40. | 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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