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。
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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