First off, the closing of the epiglottis prevents the nitrogen gas from escaping, so it is forced into your body instead.

• 要是照这个逻辑....是不是吞下去憋半秒钟之后做打嗝那个动作并且张嘴...就可以利用气化压力从嘴里高速喷出液氮呀....