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61. | principal azimuth |
| 主方位角 |
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62. | principal spectru |
| 主光谱 |
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63. | principal statement |
| 主要报表 |
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64. | principal channel |
| 主航道 |
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65. | principal strain |
| 主应变 |
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66. | foreign principal |
| 国外委托人 |
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67. | principal trace |
| 主迹 |
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68. | principal bundle |
| 主丛 |
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69. | principal variable |
| 主变数 |
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70. | principal circuit |
| 干线 |
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