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61. | The theory is simple. |
| 原理很简单: |
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62. | equivalence principle |
| 等效原理 |
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63. | box principle |
| 抽屉原理 |
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64. | variation principle |
| 变分法原理 |
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65. | Principle of Mechanic |
| 机械原理 |
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66. | invariance theory |
| 不变性原理 |
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67. | principle of electrotechnics |
| 电工原理 |
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68. | transfer principle |
| 传递原理 |
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69. | an absolute principle |
| 绝对原理 |
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70. | The Ironic Principle |
| 讽刺原理 |
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