正式和非正式渠道 informal and formal channels
正式和非正式控制 formal and informal control
正式语言和非正式语言 Formal Language and Informal Language
正式文体和非正式文体 formal varieties and informal varieties
正式约束和非正式约束 Formal constraints and Informal constraints
目前，通过正式和非正式的多种渠道快速传播各种消息。
News now spreads rapidly via a multitude of formal and informal channels.
知识在正式和非正式的环境教学中得到最好锻炼。
Knowledge of best practices in formal and informal environmental education.
在英语中有很多问候的方式可以用在正式和非正式的场合里。
There are lots of ways of greeting in English which can be used in both formal and informal situations, eg: How are you doing?
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