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| 71. | The principle of conservation of momentum holds whatever the nature of the internal forces, conservative or not. |
| 动量守恒原理则不管内力的性质如何（保守的或非保守的）都能适用。 |
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| 72. | conservation of particles |
| 粒子数的守恒 |
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| 73. | conservation of absolute vorticity |
| 绝对涡度守恒 |
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| 74. | combined parity conservation law |
| 复合宇称守恒律 |
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| 75. | conservative measurable transformation |
| 守恒可测变换 |
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| 76. | particle-conservation equation |
| 粒子数守恒方程 |
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| 77. | lepton conservation |
| [粒子]轻子守恒 |
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| 78. | As it contracts, the principle of angular momentum conservation forces it to rotate faster[ see box on opposite page]. |
| 当它收缩时，角动量守恒的原理强迫它转得更快（右页〈体盘的诞生〉。 |
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| 79. | symmetry and conservation law |
| 对称性和守恒律 |
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| 80. | conservation of movement of the centre of gravity |
| 【力】重心运动的守恒 |
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