白墨或白纸的泛黄现象 after-yellowing 埃系数 angstrom coefficient ..
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after-yellowing of paper 纸张泛黄
after yellowing 白墨泛黄
after yellowing of paper 纸张泛黄
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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