sandwichingn.夹层铺料sandwichn.三明治vt.插入；夹在中间sandwich ribbon fibre层状长条纤维sandwich shell theory夹层壳理论sandwich composite rod夹层结构复合材料杆sandwich shallow shell夹层扁壳sandwich class housing夹心阶层住房Sandwich layer foaming芯层发泡sandwich hybridization夹心杂交Sandwich configuration三明治构型sandwich foil technique夹箔技术sandwich-type element多层结构元件