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自由下落
释义
自由下落zìyóu xiàluò(1)[free fall] (2)一个物体不受任何约束地从空中下落(如不用降落伞的下落) (3)跳伞降落中,在伞未张以前的下落阶段 (4)在引力场中无约束的运动状态(如火箭在发动机关闭以后的飞行状态)
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更新时间:2025/9/12 20:10:50