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| 91. | air observation |
| 空中观察 |
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| 92. | tide observation |
| 潮汐观测 |
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| 93. | tilt observation |
| 倾斜观测 |
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| 94. | photoelectric observation |
| 光电观测 |
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| 95. | unilateral observation |
| 一侧观察 |
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| 96. | statistical observation |
| 统计观测值 |
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| 97. | astronomical observation |
| 天文观测 |
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| 98. | runway observation |
| 跑道气象观测 |
|
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| | |
| 99. | epidemiologic observation |
| 流行病学观察 |
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| 100. | preliminary observation |
| 准备性的观察 |
|
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