It is only device to measure hemodynamic by the Inert Gas Rebreathing method.
唯一体再呼吸法技术测血流学及学的仪器.
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See, once they can no longer hold their initial breath and start to hyperventilate, they might aspirate water, triggering something called a laryngospasm. This is where the person's vocal cords spasm, blocking their airways and protecting their lungs.
你看,一旦他无法再屏住最初的呼吸并开始换气过度,他可能会吸入水,引发一种叫做喉痉挛的现象。这是人的声带痉挛,阻塞呼吸道并保护肺部的地方。