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| 71. | emergency descent |
| 紧急下降 |
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| 72. | powered lowering |
| 动力下降 |
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| 73. | quality reduction |
| 质量下降 |
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| 74. | descension theory |
| 下降说 |
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| 75. | pressure decline |
| 压力下降 |
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| 76. | performance reductio |
| 性能下降 |
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| 77. | capillary depression |
| 毛细下降 |
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| 78. | descending manner |
| 下降式 |
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| 79. | gravity lowering |
| 重力下降 |
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| 80. | descensional deposit |
| 下降矿床 |
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