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2.A descent by parachute.
空投用降落伞投下收藏指正
3.a cord that is pulled to open a parachute from its pack during a descent.
一种在降落过程中把降落伞从它的包中打开的绳索。收藏指正
4.Although the Martian atmosphere is very rare,a parachute is an important decelerator in the entry,descent and landing system for Mars exploration mission.
尽管火星表面大气非常稀薄,但降落伞仍是火星探测着陆系统中一种重要的减速装置。收藏指正
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