Believe it or not, a dog's mouth is

来源: ffppyy 于 2012-09-25 20:33:33 [] [旧帖] [给我悄悄话] 阅读数 : (138 bytes)

much "cleaner" than a human being's and a cat's, in terms of both the number of bacteria specices and the total number of baterias.

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