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| 71. | walk-in observation |
| 未经预约的观察 |
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| 72. | The Search for Life in the Universe |
| 宇宙生命探索 |
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| 73. | Researches in Theoretical Geology |
| 理论地质学探索 |
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| 74. | An unaccredited school. |
| 未经认可的学校 |
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| 75. | Investigation is exploring. |
| 调查就是探索。 |
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| 76. | undeclared cargo |
| 未经申报的货物 |
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| 77. | make further explorations |
| 进一步探索（考察） |
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| 78. | unregistered pesticide |
| 未经注册除害剂 |
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| 79. | an unofficial report |
| 未经证实的报导 |
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| 80. | uncorroborated testimony. |
| 未经证实的证词 |
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