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51. | principal penalty |
| 主刑 |
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52. | principal earthquake |
| 主震 |
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53. | principal fairway |
| 主要航道 |
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54. | principal reaction |
| 知反应 |
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55. | principal ideal |
| 主理想 |
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56. | principal motion |
| 炙动 |
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57. | principal investigator |
| 首席调查员 |
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58. | principal planet |
| 主行星 |
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59. | principal matrix |
| 主矩阵 |
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60. | Principal Secretary |
| 特等秘书 |
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