The really high carbon dioxide levels triggers hyperpnea again, and the cycle starts all over.

而高浓度的二氧化碳又会再次引发呼吸急促，整个循环又开始了。

Central sleep apnea starts with an initial episode of hyperpnea, which is when the brain directs the lungs to start hyperventilating during sleep by increasing the respiratory rate.

中枢性睡眠呼吸暂停开始时，人会呼吸急促，在睡眠中，大脑增加呼吸频率，使肺通气过度。