英语语法分析

An even smaller type of interplanetary debris is the meteoroid.

有一种更小的星际碎片，是流星体。

When a meteoroid enters the atmosphere, it compresses the air in front of it.

当流星体进入大气层，它压缩的空气在前面的。

The cometary ejection play a crucial role in formation and evolution of the meteoroid stream.

彗星的喷发速度在流星群的演化过程中起着重要作用。