释义
n.
downward movement under the force of gravity only
（物体只受到重力作用时的）自由下落
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the path of a body in free fall. 自由落体的路径。
a rapid decline that cannot be stopped
（不可阻止的）迅速下降
-
her career seemed about to go into free fall. 她的事业似乎马上就要一落千丈。
the movement of a spacecraft in space without thrust from the engines
（太空航天器在无发动机推力时的）惯性运动，自由下降。
v.
move under the force of gravity only; fall rapidly
自由下落；快速下落。
