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| 71. | Of mixed racial descent. |
| 混血人后代的 |
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| 72. | posterity ; descendants |
| 后代;后裔;子孙 |
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| 73. | A descendant of such a slave. |
| 逃亡黑奴后裔 |
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| 74. | "Steep descent, slow-down" |
| 陡坡慢行 |
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| 75. | pseudogyna gemmans |
| 干母后裔 |
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| 76. | "Long descent, slow-down" |
| 长下坡慢行 |
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| 77. | a long switchback descent |
| 长而弯曲的下坡路 |
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| 78. | hadamard method of descent |
| 阿达玛下降法 |
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| 79. | a parachute descent [ drop ] |
| 降落伞降下 |
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| 80. | line of steepest descent |
| 最速下降线 |
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