他用弹弓射中了树上的苹果。

He hit the apple on the tree with his ___slingshot.

弹弓效应将飞船加速甩向太空深处。

The spacecraft was ___slingshotted into deep space by the gravitational assist.

这艘航天器通过木星的引力弹弓效应获得了额外的速度。

The spacecraft used Jupiter's gravity for a ___slingshot maneuver to boost its speed.