我爱微辣
氢气：Hydrogen,H2 氮气：Nitrogen ,N2 氩气：Argon,Ar 氦气：Helium,He 氧气 ：Oxygen,O2 氧元素为O,但是氧气是由氧分子构成的,一个氧分子由2个氧原子构成,所以氧分子为O2,氮气也一样.
爆米花糖糖
氧气oxygen臭氧由氧气和紫外线发生反应而产生。Ozone is produced by the reaction between oxygen and ultraviolet light.火箭中的爆炸性混合物由燃料和氧气构成。The explosive mixture in a rocket consists of both a fuel and a supply of oxygen.
