Free fall
01
自由落体, 在重力影响下的下落
the motion of an object or person falling solely under the influence of gravity
例子
The astronaut felt weightless during free fall in space.
宇航员在太空自由落体期间感到失重。
02
自由落体, 急剧下降
a sudden sharp decrease in some quantity
03
自由落体
the ideal falling motion of something subject only to a gravitational field
