Because there was slightly more matter, the collisions quickly depleted all the anti-matter and left just enough matter to create stars, planets, and eventually us.
2018年12月六级真题（第一套）听力 Section A
柯林斯高阶英汉双解学习词典释义
N-VAR
碰撞;相撞
A collision occurs when a moving object crashes into something.