外层包覆 meaning in English

external sheath

We think . that s surrounded by the outer core , which is liquid
被液态的外层包覆
When dispersed in water , the electric property of composite particles surface is similar to that of corresponding oxides , while after al2o3 / zro2 - coated , the electric property of graphite surface was similar to that of zro2
复合粉体分散在水中后，表面电性特征与所包覆氧化物类似，双层包覆后复合粉体表面电位特征与最外层包覆物相似。
The third one is that the porous silica spheres are used as cores instead of solid silica beads , which give much less density . then , the magnetic property is imparted by deposition of nickel by using electroless plating , while the dielectric property is offered by the outerlayer of titania . the morphology and structure of the particles were characterized by sem , tem , and xrd
考虑到多孔二氧化硅微球的奇特性质，采用化学镀的方法，在多孔二氧化硅微球上沉积了镍层，形成多孔二氧化硅镍( sio _ 2 ni )磁性微球，然后在该微球外层包覆了二氧化钛，制得具有无机结构的多孔二氧化硅镍二氧化钛( sio _ 2 ni tio _ 2 )多层核-壳型复合颗粒。