Bacteria are very small organisms, some of which cause diseases.

细菌是非常小的有机体，有些细菌会导致疾病。

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Extremely small as bacteria are, they often cause diseases.

虽然细菌很小，它们常常引起疾病。

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Extremely small as bacteria are, they often cause diseases.

虽然细菌很小，它们常常引起疾病。

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