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41. | rate-of-descent hold |
| 下降率保持 |
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42. | "Long descent, slow-down" |
| 长下坡慢行 |
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43. | Of mixed racial descent. |
| 混血人后代的 |
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44. | descent of presenting part |
| 先露部下降 |
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45. | hadamard method of descent |
| 阿达玛下降法 |
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46. | path of quickest descent |
| 最快下落路线 |
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47. | "Steep descent, slow-down" |
| 陡坡慢行 |
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48. | trace one's descent from |
| 追溯于…的祖辈 |
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49. | line of steepest descent |
| 最速下降线 |
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50. | descent velocity of burden |
| 炉料下降速度 |
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