英语语法分析

Parasympathetic System relaxes the body.

副交感神经系统使身体放松。

The autonomic nervous system has two parts: the sympathetic and the parasympathetic nervous systems.

自主神经系统又分为两部分：交感神经系统和副交感神经系统。

This will activate your parasympathetic nervous system which will calm you down and slow your heart rate.

这样能激活副交感神经，有助于安神和降低心率。