其次是经过大量的调研和分析，提出了环境设计的基本要求和总的设计原则。
Then, through investigation and analysis, it presents the essential requirements and design principles of environmental design.
本文经过大量的调研和仔细的设计、完善，建成了具有空气分级、燃料再燃等多种用途的一维热态试验系统。
After a lot of survey and careful design work, a one-dimensional test system with multi-function such as air stage and fuel reburning is built up.
在经过大量调研和查阅有关资料的基础上，对我国已建和在建地铁的消防设施进行了介绍，并对我国地铁存在的主要消防问题进行了分析。
Based on great deal of investigation and material. It makes an introduction in subway fire facilities of China. The main fire problems of the subways of our country are also analysis in this article.
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