The paper has discussed the method of synthesis of cationic-type polyacrylamide and it's application as flocculant, retention aid, drainage aid and strength aid.

本文介绍了阳离子型聚丙烯酰胺的制备方法及其在造纸工业中作为助留助滤剂、增强剂、絮凝剂的作用机理和应用条件。

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Reducing the size of patios or other paved surfaces will also aid internal drainage.

减少了院子或其他铺设路面也将有助于内部排水的大小。

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So need to learn how to marketing, to assist in the aid of software, so as to achieve the best effect of drainage.

所以要先学会如何营销，在借助软件去辅助，这样才能达到最佳的引流效果。

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The bulb creates a gentle suction to aid drainage.

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