... main soil group 主要土类 main soil pit 基本剖面坑 main bearing of underslung type 倒挂式主轴承 ...
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As a main group of animals in the soil, the earthworms play important functions in ecosystem.
蚯蚓是土壤中的主要动物类群,在生态系统系统中具有重要的功能。
The dark loessial soil (Heilutu) is not only a main zonal soil group in the loess plateau of northwestern China, but an ancient cultivated soil.
黑垆土是我国西北黄土侵蚀地区主要的地带性土类,也是一种古老的耕种土壤。
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