last collision的用法和樣例：
例句
- This debris was recaptured a few hundred years after each collision.
在每一次碰撞之后幾百年，這些碎屑又被重新俘虜。 - The whole thing looks like a ring to us on Earth because we're seeing the collision head-on, rather than from the side.
對于地球上的我們，整個(gè)暗物質(zhì)看起來(lái)象一個(gè)巨環(huán)，因為這次碰撞是我們從前面，而不是從側面觀(guān)察到的。
