any of various fine-grained silty soils that become waxy and very sticky mud when saturated with water. 任何细颗粒的淤泥土壤，饱和时柔软而黏稠。
A fine silty soil, common in the southern and western United States, that forms an unusually sticky mud when wet. 坚硬粘土一种细而粘稠的土壤，在美国南部和西部很常见，通常湿润时形成粘糊的泥浆
