In some industries, such as pulp and paper, economic methods are not presently available for colour removal.

在纸浆和造纸一些行业，例如，经济的方法目前没有搬迁现有的颜色。

youdao

In some industries, such as pulp and paper, economic methods are not presently available for colour removal.

在纸浆和造纸一些行业，例如，经济的方法目前没有搬迁现有的颜色。

youdao