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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. | The Ironic Principle |
| 讽刺原理 |
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44. | an absolute principle |
| 绝对原理 |
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45. | principle of motion picture |
| 电影原理 |
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46. | equivalence principle |
| 等效原理 |
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47. | variation principle |
| 变分法原理 |
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48. | energy principle |
| 能量原理 |
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49. | transfer principle |
| 传递原理 |
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50. | energy conservation principle |
| 能量守恒原理 |
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