Question

为什么在燃烧的大楼中人们呼吸困难?高手来（英语更好）

Answer 1

First,when a buding is burning,the oxeygen will be grually used up,and produce much carbon dioxide at the same time .In other words,there will be more and more carbon dioxide,but less and less oxygen.What is more,we can only inhale the Oxygen ,so we will find it more and more difficult to breathe.