求翻译：本实验所采用的材料为工业淀粉、锯末、粘土和水。经试验表明，只用淀粉、锯末和水来模拟粪便，不仅含水率达不到要求，而且模拟出来的粪便流动性很大，加入少量的粘土起到结构支撑的作用，是人工模拟粪便容易成形，不易流动是什么意思？

This experiment used materials into industrial starch, sawdust, clay and water. Tests showed that starch, sawdust and water to simulate only dung, not only the moisture content does not meet the requirements and highly simulated faeces, adding a small amount of clay play the role of structural support, is a simulation of a human feces easily formed, easy flow