This is the concept of the sandwich layer.

这是夹心层的概念。

youdao

PVC Pipe with foamed sandwich layer is a new Piping material.

芯层发泡PVC管材是一种新型管道材料。

youdao

The utility model is characterized in that an inner sandwich layer is arranged in the baling belt.

该种打包带的特色，是在打包带的内部设有内夹层。

youdao

In each case, the resulting image is focused by a clever arrangement of lenses on to a three-layer sandwich made of special materials.

ECONOMIST: Curtains for celluloid

The first layer of the sandwich is photoelectric.

ECONOMIST: Curtains for celluloid

The device that Dr Kirczenow and Dr Rego had in mind is called a semiconductor heterostructure a semiconductor sandwich made of a thin layer of aluminium gallium arsenide held between two thicker layers of gallium arsenide.

ECONOMIST: Microelectronics