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51. | line of quickest descent |
| 最快速下降线 |
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52. | rate-of-descent sensor |
| 下降率传感器 |
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53. | Ancestral descent or lineage. |
| 世系,血统 |
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54. | A descending slope; a descent. |
| 倾斜下倾的坡;下斜 |
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55. | make a descent upon |
| 侵入,袭击 |
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56. | A descent by parachute. |
| 空投用降落伞投下 |
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57. | rate-of-descent control |
| 下降率控制 |
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58. | A downward movement; descent. |
| 向下的运动;下降 |
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59. | rate-of-descent indicator |
| 下降率指示器;爬升率指示器 |
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60. | a vertiginous drop, descent, etc |
| 令人眩晕的下落、 下降等. |
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