The backing material must be as smooth as possible, and the circuitry sealed beneath a layer composed of a polymer-metal-polymer sandwich.

这种电路的基板材料也非常平滑，在这个电路的下次是由聚合物-金属-聚合物这种类似三明治的夹心结构组成的。

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They are composed of four different materials, which must be uniformly deposited on a backing material, or substrate.

它们由四种不同元素组成。四元素沉积在一基质元素中。

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Experiments indicate that the newly developed material of roll-sleeve meets the requirements of high speed roll casting technology, can give strong backing to utmost roll-casting technology.

通过对材料的检测分析与工艺实验，证明研制出来的材料的综合性能优良，为极限铸轧技术的应用提供了有力支持。

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The recycled blue jeans will be used as both sound absorption material and carpet backing.

FORBES: Ford Focus Uses Recycled Jeans

The most promising sail material has a carbon-fibre backing coated with a thin layer (just a few tens of atoms thick) of aluminium.

ECONOMIST: Rockets are not the only way to travel through outer space

"Although inflation seemed likely to remain above the 2 percent target over the next two years, the degree of slack in the economy, and the likely positive response of supply capacity to increased demand, meant that higher output growth would not necessarily lead to any material additional inflationary pressure, " those backing another stimulus argued, according to the minutes.

NPR: BoE Governor Backed More Stimulus For UK Economy