The populations of bacteria gradually increased at the yellowing stage, and decreased after yellowing.

细菌数量则是在变黄期逐渐增加，烟叶变黄时达最大，以后逐渐减少。

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The populations of bacteria gradually increased at the yellowing stage, and decreased after yellowing.

细菌数量则是在变黄期逐渐增加，烟叶变黄时达最大，以后逐渐减少。

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