Organic food refers to food that is by - and - large untainted by pollution.

總體來說,有機食品是一種未被污染的食品.

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One finds good and bad smells in the air, but the air itself is untainted.

人可以從空氣的氣味中發(fā)現(xiàn)好與壞, 但空氣本身卻不受好與壞的影響.

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