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| 41. | Did supermassive black holes need a helping hand to grow to be so big? |
| 超大质量黑洞的形成是否须藉助于外力？ |
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| 42. | 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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| 43. | 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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| 44. | The second law says that when an outside force acts on an object, |
| 第二定律指出，当一个外力作用于一个物体时， |
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| -- 来源 -- 综合英语第3册 - Unit 7 Famous Scientists Text A |
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| 45. | 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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| 46. | He claimed to have done the work without help. |
| 他声言未借助外力而完成了这项工作。 |
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| 47. | 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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| 48. | A body at rest will not move till a force is exerted on it. |
| 若无外力的作用，静止的物体则不会移动。 |
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| 49. | ask for trouble; invite criticism. |
| 引起麻烦；引起危机。 |
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| 50. | Vertical live loads include all vertical live loads other than dead loads. Lateral live loads are external forces due to the action of wind, earth, and hydrostatic pressure. |
| 侧向活荷载是由于风压、土压和静水压力作用引起的外力。 |
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