设计活动是产品开发过程中最重要的环节之一。在设计过程中，概念设计是最富创新性的阶段。
Design activity is one of key points in the products development procedure, while conceptual design is most important in design activity.
教学活动的设计和使用成为英语课堂一个十分重要的环节，对最终的教学效果起不可或缺的作用。
The design of teaching activities and the use of English as a very important part of the classroom, the teaching effect on the final play an indispensable role.
用社会理性指导社会制度设计，是社会工程活动的基本环节。
Social logos directs the activity of institutional design and is the essential part of social engineering activity.
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