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31. | The theory is simple. |
| 原理很简单: |
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32. | principle of electrotechnics |
| 电工原理 |
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33. | The Ironic Principle |
| 讽刺原理 |
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34. | an absolute principle |
| 绝对原理 |
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35. | principle of motion picture |
| 电影原理 |
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36. | equivalence principle |
| 等效原理 |
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37. | variation principle |
| 变分法原理 |
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38. | energy principle |
| 能量原理 |
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39. | transfer principle |
| 传递原理 |
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40. | energy conservation principle |
| 能量守恒原理 |
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