臭氧是氧气与紫外线发生化学反应而产生的。

Ozone is produced by the reaction between oxygen and ultraviolet light.

《柯林斯英汉双解大词典》

有几种化学物质取代了氧气。

Several chemicals have displaced the oxygen.

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热量引起化学反应，释放出氧气。

The heat brings about a chemical reaction, and oxygen is liberated.

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氧气与铁中的杂质发生剧烈的化学反应。

The oxygen react vigorously with the impurity in the iron.

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氧气的化学符号是O2。

The symbol for oxygen is O2.

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铁可以与氧气发生化学反应。

Iron can react with oxygen.

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铁可以与氧气发生化学反应。

Iron can react with oxygen.

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