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| 71. | descent velocity of burden |
| 炉料下降速度 |
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| 72. | "Steep descent, slow-down" |
| 陡坡慢行 |
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| 73. | line of steepest descent |
| 最速下降线 |
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| 74. | make a descent upon |
| 侵入，袭击 |
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| 75. | path of quickest descent |
| 最快下落路线 |
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| 76. | descent of presenting part |
| 先露部下降 |
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| 77. | rate-of-descent hold |
| 下降率保持 |
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| 78. | rate-of-descent sensor |
| 下降率传感器 |
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| 79. | trace one's descent from |
| 追溯于…的祖辈 |
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| 80. | rate-of-descent control |
| 下降率控制 |
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