under-clay是什么意思

用法例句

Based on large numbers of geotechnical testst,he engineering characteristics of silty clay under water in the foundation of Suzhou—Nantong large bridge in lower reach of Yangtze River,Jiangsu Province,China,was studied.

基于大量的土工试验,对长江下游苏通大桥工程区水下粉质黏土的工程特性进行研究,发现粉质黏土的不同指标的变异系数差别较大。