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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. | 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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| 33. | opportunity for,or help in,starting |
| 开始的时机;起推动作用的外力 |
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| 34. | cause a commotion; make a stir; cause an accident. |
| 引起骚乱；引起流行；引起事故。 |
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| 35. | It's describing a fire that needs a spark to ignite itself. |
| 这是用来描述需要外力引发的 火灾 |
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| 36. | Are they consistent with blunt force trauma? |
| 有可能是用钝器外力重击所致吗? |
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| 37. | To topple, as from power or a high position;fall. |
| 下跌因外力或从高处倒下；倒下 |
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| 38. | 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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| 39. | 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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| 40. | 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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