| 单词 | free-fall |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔MACHINE〕The National Association for Elevator Safety says that most elevators have safety devices that prevent free-falls. 国家电梯安全协会说大多数电梯都有防止自由坠落的安全装置。朗文写作活用〔ballistic missile〕A projectile that assumes a free-falling trajectory after an internally guided, self-powered ascent.弹道导弹：在内部导向、自备动力的上升后假设为自由落体的弹道美国传统〔free-fall〕The jumpers were required to have an eight-second free-fall.跳伞者按照规定下降八秒之后开始张伞。文馨英汉〔microgravity〕An environment in which there is very little net gravitational force, as of a free-falling object, an orbit, or interstellar space.微重力：对于自由落体、轨道、或是星球间空间有着非常微弱净重力的环境美国传统〔parachute〕Any of various similar unpowered devices that are used for retarding free-speeding or free-falling motion.缓降物：用于阻碍加速前进或自由落体运动的几种类似无动力装置中的一种美国传统 |
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