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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