Her hosts held a festive celebration, then showed her the dam, an eight-foot-high sand-and-concrete structure that traps and filters water so that it's available and drinkable year-round.
接待她的主人举行了节日庆典，然后，带她看了水坝——八英尺高的沙和混凝土结构，圈住并过滤能够全年供应的饮用水。
The study of paleostress fields is helpful to the analysis of formation mechanism and distribution regularity of traps and to the correct interpretation of other structure appearances;
进行古应力场的研究，有助于分析圈闭的形成机制和分布规律，以及正确解释其他一些构造现象；
Oil and gas traps should have both an equilibrium structure and a dissipative structure.
油气圈闭要同时具备平衡结构和耗散结构。
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