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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. | 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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| 33. | 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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| 34. | The causes of sciatica include: prolapsed lumbar intervertebral disc; spinal canal stenosis of the lumbar vertebra and lumbar hyperosteogeny. |
| 是指位于下腰部的坐骨神经，受到外力的压迫而产生后下腰部疼痛并反射到病侧下肢的情形。 |
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| 35. | 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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| 36. | 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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| 37. | 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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| 38. | 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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| 39. | 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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| 40. | Wound (or trauma ):Break in any Body tissue due to external action (including surgery). |
| 创伤:由外力(包括手术)引起的身体组织破裂。 |
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