Also, in the cold region sea and so on, natural environment is extremely bad condition, the durability of the concrete structure is other important research topic.
又，在寒冷地域的海上等自然环境相当恶劣条件下混凝土结构的耐久性问题是另外一个重要研究题目。
Reinforced concrete structure of seaport wharf is located at severe natural environment and work condition, and erosion from seawater damages seriously the durability of structures.
海港码头钢筋混凝土结构处于恶劣的自然环境和工作环境中，海水的侵蚀严重危害结构的耐久性。
The structure of the layer net adopts a grid shape in order to maintain the natural condition of the corn root growth.
为了保持玉米根系生长的自然状况，层网的结构 是网格形状。
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