二恶英在环境和食品中以一种复杂的混合物形式出现。

Dioxins occur as a complex mixture in the environment and in food.

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如果你仔细观察，你会发现这是三种不同形式的碳的混合物。

If you look more carefully, you will find that this is a blend of three different forms of carbon.

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原油是碳氢化合物的混合物，是各种形式的有价值的这个自然。

Crude oil is a mixture of various hydrocarbons and is valuable in this natural form.

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But, if you look more carefully, you will find that this is a blend of three different forms of carbon.

但是，如果你们再认真一点，会发现,它是三种形式的碳的混合物。

麻省理工公开课 - 固态化学导论课程节选