Can you touch or feel oxygen in the air? 你能触摸或感受到空气中氧气吗？

　　Oxygen has very unique characteristics. 氧气有非常独特的性质。

　　You cannot see oxygen because it doesn't have a color. 你看不到氧气，因为它没有颜色。

　　Also, oxygen does not melt in water. 而且，氧气不溶于水。

　　Oxygen does't have a smell. 氧气是无味的。

　　However, it helps burn other things. 然而，它有助于其它物体的燃烧。

　　Can you live without oxygen.  没有氧气你能存活吗？

　　Definitely not. 当然是不行的。

　　We cannot live without oxygen even for more than a few minutes. 没有氧气我们甚至都活不过几分钟。