There are two groups of hydrolysable tannins: gallotannins and ellagitannins on the basis of structural characteristics.

根据水解单宁结构特性的差异，又将其分为棓单宁和鞣花单宁。

In the paper, the comentropy theory is extended and applied to analyze the structural characteristics and law in the process of evolution of hydrologic cycle.

该文拓展了水文循环演化过程中摘理念，并在水文结构特征和规律分析中应用，发现判别其突变或灾变的阈值指标，为预测水文循环演化趋势提供了新思维。

The working mechanism and the structural characteristics of KMLZ slant narrow flow deoiler for settled slag and its application in treating industrial sewage are described.

介绍了KMLZ斜窄流沉渣除油器的工作原理、结构特征及其在工业污水中的应用。