It's like a slingshot — the harder you pull, the more propulsion you generate.
如同一把弹弓，拉的越紧，射的越远。
If a third star ventures too close, the bully binary flings it clear like a slingshot.
如果第三颗恒星冒险与它们距离过近，恶霸双星会像弹弓一样抛出这个恒星。
WASP-17 likely had a close encounter with a larger planet, and the gravitational interaction acted like a slingshot to put WASP-17 on its odd course, the astronomers figure.
天文学家们估计，WAPS - 17行星有可能和一颗较大的卫星又一次近距离接触，引力相互作用就好像弹弓，将WASP - 17放入奇怪的轨迹。
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