Opiates and opioids are central nervous system or CNS depressants.

麻醉剂和阿片类药物是中枢神经系统或中枢神经系统抑制剂。

The CNS controls our ability to breathe and keep our heart beating, and when depressed too far by CNS depressants, these functions can slow down and eventually stop.

中枢神经系统控制我们呼吸和保持心脏跳动的能力，当中枢神经系统抑制剂抑制得太过时，这些功能会减慢并最终停止。