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...
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