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| 81. | carry out oBservations |
| 进行观察 |
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| 82. | observational technique |
| 观察技术 |
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| 83. | Observatory [disarmament] |
| 观察处 |
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| 84. | observation cabin |
| 观察房 |
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| 85. | observed altitude |
| 观察高度 |
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| 86. | seismic observation |
| 地震观察 |
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| 87. | observing response |
| 观察反应 |
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| 88. | observation aperture |
| 观察孔径 |
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| 89. | viewing position |
| 观察位置 |
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| 90. | observation level |
| 观察阶段 |
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