multilevel structures

• 多层结构

multilevel structures的用法和样例：

例句

1. Pdf- Three structures and the module technology realize the staff data management system pdf.
   三层结构及组件技术实现员工数据管理系统。
2. Permeability of basalt fibre reinforcements with two different structures that are laminated mainly depends on fabric with lower permeability.
   两种不同结构的玄武岩增强材料叠合在一起的铺层结构的渗透率主要取决于渗透率较小的增强材料的渗透率。