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| 51. | descent of piston |
| 活塞下行 |
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| 52. | steepest descent algorithm |
| 最速下降算法 |
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| 53. | a steep descent |
| 陡峭的坡道 |
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| 54. | descent propulsion system |
| 降落推进系统 |
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| 55. | minimum descent altitude |
| 最低下降高度 |
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| 56. | a rapid descent |
| 急陡的下坡 |
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| 57. | rate of descent |
| 垂直下降速度 |
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| 58. | descent of testicle |
| 睾丸下降 |
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| 59. | line of descent |
| 系谱 |
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| 60. | family origin,descent |
| 家庭出身,门第 |
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