In fact, in chemical accidents, hydrogen sulfide is known to -- if you breathe too much of it, you collapse to the ground, you appear dead, but if you were brought out into room air, you can be reanimated without harm, if they do that quickly.
実際 化学物質事故で 硫化水素を一定以上吸い込むと 倒れてしまうことが知られています そして死んだかのように見えますが 大気のあるところに素早く連れ出されれば 支障なく生き返ることができます