Coal basin are a basic tectonic unit in the formation of coal measures.
含煤盆地是煤系形成的基本地质构造单元。
Soil aggregate is the main component of soil and the basic unit of soil structure. Its formation and stability are realized by the effects of all kinds of cementing substance in soil.
土壤团聚体是土壤的重要组成部分、土壤结构的基本单位，其形成和稳定主要是通过土壤中各种胶结物质的胶结作用实现的。
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