... turn-over door 翻转门 turn-over forms 翻转模板 turnover time 周转时间 ...
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All three of these forms are considered to be types of mechanical pulp, which means they will turn yellow over time because the lignin is not completely removed.
所有这三种形式都被认为是各类机械纸浆，这意味着它们将变成黄色，因为随着时间的推移木质素没有完全消除。
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