第一种是自发的新陈代谢系统，它的控制集中在脑干上。
The first is an automatic, metabolic system whose control is centered in the brain stem.
它能忽略或凌驾于自动的新陈代谢系统之上，并产生不规则的的呼吸模式。
It is capable of ignoring or overriding the automatic, metabolic system and produces an irregular pattern of breathing.
在睡眠期间，自动的新陈代谢系统对血液中二氧化碳和氧气的含量反应并不灵敏。
During sleep the automatic metabolic system is less responsive to carbon dioxide levels and oxygen levels in the blood.
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