The laser beam melts a portion of the steel core and the segment backing metal, forming a weld.

激光光束熔体部分钢铁核心和后盾金属部分，形成焊缝。

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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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A multilayer sliding bearing includes a rigid metal backing (12) having a metal bearing liner (14) attached thereto.

一种多层滑动轴承，包括具有贴于其上的金属轴承衬垫(14)的刚性金属背衬(12)。

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If gold from nations such as Greece, Italy and Ireland were to be tied up backing the bonds, he said, this would remove the potential for official sales of this metal from these sources.

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