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| 71. | observation item |
| 观察项目 |
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| 72. | daylight observation |
| 白天观测 |
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| 73. | observation apparatus |
| 观测设备 |
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| 74. | observation program |
| 观察纲要 |
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| 75. | observation base |
| 观测基线 |
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| 76. | observation group |
| 观测组 |
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| 77. | observation desk |
| 试验台|观察台 |
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| 78. | observation parallax |
| 观察视差 |
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| 79. | observation frequency |
| 观测次数;观测频率 |
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| 80. | observation room |
| 观察室 |
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