Like the Dr. Jekyll and Mr. Hyde character of Robert Louis Stevenson's curious novel, ozone has two personalities. Sometimes it is the good guy, sometimes the bad. Ozone is one of the gases in Earth's atmosphere. It is a cousin of the oxygen molecule on which we depend for life. The oxygen molecule is two oxygen atoms bound together. The ozone molecule is three. That extra atom makes a big difference. Although ozone can play "good" roles in the atmosphere, you don't want to breathe it!
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机译：就像罗伯特·路易斯·史蒂文森（Robert Louis Stevenson）的奇异小说中的杰基尔博士和海德先生一样，臭氧具有两种个性。有时是好人，有时是坏人。臭氧是地球大气中的气体之一。它是我们赖以生存的氧分子的表亲。氧分子是结合在一起的两个氧原子。臭氧分子是三个。多余的原子有很大的不同。尽管臭氧可以在大气中起到“良好”的作用，但您不想呼吸！
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