在热带地区(tropic region),只有在充足的水分条件下,高温才能促进原生矿物的深度风 化，形成砖红壤，而在缺少水分的条件下，风化强度较弱，土壤向燥红土方向...
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It is high rate of malaria in the tropic region.
热带地区的疟疾的发病率高。
The results show that the performance of heat transfer in lower re number region is poly tropic, and that in higher re region is similar to conventional channel.
结果表明，窄隙流道内的换热在低雷诺数区表现出与普通流道不同的多变特性，而在高雷诺数区与普通流道相近。
Karst region in southwest of China is located in the sub tropic with good combination of water and temperature.
我国西南岩溶区位于亚热带，水热条件良好，水资源储存量相当丰富。
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