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81. | routine observation |
| 定期观察 |
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82. | observing system |
| 观察系统 |
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83. | hour of observation |
| 观察时间 |
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84. | repeated observation |
| 重复观察 |
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85. | controlled observation |
| 控制观察 |
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86. | scattered observatio |
| 分散观察 |
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87. | audit observation |
| 审计观察 |
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88. | radiosonde observation |
| 探空仪观察 |
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89. | batching tracking |
| 分批观察 |
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90. | range of observation |
| 观察范围 |
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