anions阴离子anionn.阴离子；负离子anion cation balance阴阳离子平衡anionic active agent阴离子活性剂Anion reducing agent阴离子还原剂anion exchange tower阴离子交换塔anionic polypropylene负离子丙纶纤维anionoid substitution类阴离子取代anion dispersed rosin阴离子分散松香胶anionic surface agent阴离子表面活性剂anionic trash catcher定着剂anionic wetting agent阴离子型湿润剂