In this paper, the study of concrete is hierarchically classified into four levels, viz macroscopic, mesoscopic, microscopic and nasoscopic level. The research approach and applied fields of four levels are apprehensively reviewed.是什么意思_In this paper, the study of concrete is hierarchically classified into four levels, viz macroscopic, mesoscopic, microscopic and nasoscopic level. The research approach and applied fields of four levels are apprehensively reviewed.在线翻译_英语_读音_用法_例句