That's the main ingredient in smog.

这就是烟雾中的主要成分。

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The main ingredient in Guacamole is?

酪梨沙拉酱中最主要的材料是？

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What is the main ingredient in Houmous?

什麽是鹰嘴豆芝麻沙拉酱的主要材料?。

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It is true that flexibility is the main ingredient in a successful congressional life.

CNN: Commentary: A 'congressional spouse' breaks barriers

The produce is used by Can Curreu's restaurant - lemons, for example, are the main ingredient in the silky-smooth sorbet.

BBC: The three colours of Ibiza

Merck is pouring tens of millions into an experimental treatment for a new type of Alzheimer's drug meant to limit the main ingredient in the brain-damaging plaques believed to cause the disease.

WSJ: CEO: Risks key for Merck to succeed, help patients