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| 81. | observed frequency |
| 观察频数 |
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| 82. | observation cabin |
| 观察房 |
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| 83. | observation level |
| 观察阶段 |
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| 84. | orthographical view |
| 正射观察 |
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| 85. | observation sub |
| 观察潜水器 |
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| 86. | observe a tendency |
| 观察趋势 |
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| 87. | observational research |
| 观察研究 |
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| 88. | observed profile |
| 观察剖面图 |
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| 89. | observational statement |
| 观察陈述 |
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| 90. | distant surveillance |
| 远距离观察 |
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