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| 41. | During its brief existence, the pion carries momentum from one nucleon to the other. |
| 在它短暂的存在期间内，它将动量从一个核子带到另一个核子。 |
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| 42. | In this chapter we will discuss angular momentum. |
| 本章将讨论角动量。 |
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| 43. | In undisturbed inertial motion, the angular momentum is constant. |
| 在无扰动惯性运动中，角动量是恒定的。 |
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| 44. | Momentum conservation is a consequence of Newton's laws. |
| 动量守恒是牛顿定律的一个推论。 |
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| 45. | The law of momentum conservation could supplant Newton's third law. |
| 动量守恒定律可以取代牛顿第三定律。 |
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| 46. | The lines of zero angular momentum separate the flow into two areas of negative and two areas of positive angular momentum. |
| 零角动量的曲线把物质的流动分成两个正角动量区和两个负角动量区。 |
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| 47. | In other words, the magnitude of the angular momentum is increased, its direction remaining the same. |
| 换句话说，即角动量的大小增加了，但其方向不变。 |
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| 48. | The larger the mass M, the smaller the kinetic energy associated with a given momentum. |
| 质量M愈大，则与给定动量相关联的动能就愈 |
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| 49. | Longitudinally polarized electrons are the electrons with spin and momentum pointing in the same direction. |
| 纵向极化电子，就是自旋和动量方向相同的电子。 |
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| 50. | Once he had leaped the psychological hurdle toward decision the momentum of preparation took over. |
| 一旦当他逾越了心理上的障碍而做出决定时，准备的势头就开始了。 |
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