The main categories of chemical product derived from starch are surfactants, super absorptive polymers, biodegradable plastics, flocculating agents and adhesives.

重点介绍的这类化学品有：表面活性剂、超强吸水剂、可生物降解塑料、絮凝剂和粘结剂等。

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For the main pressure-bearing parts of equipment in categories II, III and IV, this must take the form of a certificate of specific product control.

即二类，三类，四类的压力容器中的主承压部件，必须经过特定的产品控制型式，然后获得相关的证书。

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The catalog, out April 1, will feature five main product categories: entertainment, meals, grocery, drugstore and gift shop.

FORBES: Another Swing And Miss For Kozmo.com