| 单词 | θ207487 | 
| 释义 | society > travel > air or space travel > space flight > 			[noun]		 > a space shot or flight > course or trajectory of spacecraft (25)		 Subcategories:— 			escape from gravity field of planet			(2)		 — 			loss of surface material in atmosphere			(1)		 — 			orbiting			(6)		 — 			entry into specific trajectory or orbit			(4)		 — 			moving out of orbit			(1)		 — 			plan of successive trajectories			(1)		 — 			middle of course			(1)		 — 			point at greatest distance from earth			(1)		 — 			point in lunar orbit			(2)		 — 			close approach to a celestial body			(2)		 — 			course change by use of gravitational field			(1)		 — 			narrow area to be passed through			(1)		 — 			positioning on return path using gravitation			(1)		 — 			return to earth's atmosphere			(1)		  | 
	
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