Chapter Three: This chapter is going to set out the vital function of environmental sign system in city historic districts protection, through the analysis of home and abroad outstanding cases.

第三章：通过对国内外几个优秀案例的分析，阐述环境标识系统的设计在保护城市历史街区中所起到的重要作用。

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Through LCA analysis of three road base materials and application, the performance of environment protection, technologies, applying results and economic effects have been researched.

通过对三种典型基层材料的LCA对比分析以及工程应用研究，对该种材料的环保性能、施工工艺、应用效果以及经济效益进行了研究。

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Between them, Williams and Hook held the Zulu advance at bay for a further hour, while smashing holes through another three walls to evacuate eight patients to the protection of the garrison's inner defensive ring.

BBC: Wales