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| 81. | rate-of-descent control |
| 下降率控制 |
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| 82. | trace one's descent from |
| 追溯于…的祖辈 |
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| 83. | descent of presenting part |
| 先露部下降 |
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| 84. | A descent by parachute. |
| 空投用降落伞投下 |
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| 85. | descent velocity of burden |
| 炉料下降速度 |
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| 86. | make a descent upon |
| 侵入，袭击 |
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| 87. | rate-of-descent sensor |
| 下降率传感器 |
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| 88. | rate-of-descent indicator |
| 下降率指示器;爬升率指示器 |
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| 89. | Ancestral descent or lineage. |
| 世系，血统 |
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| 90. | line of quickest descent |
| 最快速下降线 |
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