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| 41. | The theory is simple. |
| 原理很简单： |
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| 42. | principle of electrotechnics |
| 电工原理 |
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| 43. | an absolute principle |
| 绝对原理 |
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| 44. | equivalence principle |
| 等效原理 |
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| 45. | energy principle |
| 能量原理 |
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| 46. | transfer principle |
| 传递原理 |
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| 47. | invariance theory |
| 不变性原理 |
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| 48. | The Ironic Principle |
| 讽刺原理 |
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| 49. | variation principle |
| 变分法原理 |
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| 50. | principle of motion picture |
| 电影原理 |
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