控制可以是闭环的也可以是开环的。
亚胺基杂环丙烷季铵盐的阳离子，一定是按协同反应的方式开环的。
The aziridinium ions must all be opened by a concerted process.
推动开环的教育教学理念，创建开放式、国际化的学习机会和平台；
In education, we are embracing the 'open loop university' concept, providing open-access learning opportunities and building an internationalized platform.
应用推荐