Epoxides, episulphides and ethylene imines also polymerize via similar cyclic onium ion mechanisms.

环氧化合物，环硫化合物和胺也可以按类似于环氧?胱拥幕?理进行聚合。

This paper discussed study on the development physi cal and chemical properties,crop safety,and application prospect of fosamine amm onium in China.

评述膦的开发、特性、安全性及其在中国的应用前景。