free-fall
n.
also freefall, 1919, originally of parachutists and in rocketry, from free, adj. + fall, v.. Related: Free-falling (1962).
词汇 | free-fall |
词根词缀 | Online Etymology Dictionary free-fall n. also freefall, 1919, originally of parachutists and in rocketry, from free, adj. + fall, v.. Related: Free-falling (1962). |
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