英语语法分析

The Crab Pulsar is slowing down.

蟹状星云脉冲星变慢。

This is not the pulsar, but this one is.

这颗不是，但这颗是。

There is an object which we call the Crab Pulsar.

有一个物体叫做，蟹状星云脉冲星。