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

氧合物，合物和乙烯亚胺也可以按类似于氧?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.

评述了调节膦的开、、安全及其在中国的应用前景。