英语高手!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust

氧气
O2

oxygen = oxygenium 氧

就是 氧气 昂 .
oxygend 的汉语即氧气~~

carbon dioxide是二氧化碳.

化学上的元素符号都和这有关的昂...