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| 71. | observing response |
| 观察反应 |
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| 72. | observation oscilloscope |
| 观察示波器 |
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| 73. | observation plan |
| 观察方案 |
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| 74. | seismic observation |
| 地震观察 |
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| 75. | observation tank |
| 观察舱 |
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| 76. | observed altitude |
| 观察高度 |
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| 77. | observational technique |
| 观察技术 |
|
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| 78. | viewing position |
| 观察位置 |
|
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| 79. | Observatory [disarmament] |
| 观察处 |
|
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| 80. | carry out oBservations |
| 进行观察 |
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