rolloutn.
英 美 'rol,aʊt
中文n. 首次展示；[航] 滑跑（飞机着陆时在跑道上滑跑减速的阶段）
词根词源
rollout (n.)also roll-out, 1957, originally of airplanes, from verbal phrase, from roll (v.) + out (adv.). As a type of U.S. football play from 1959.
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