The foam dressing may have a water-impervious backing layer, which extends all the way over the top of the dressing and down to the wound-contacting surface.

泡沫敷料可具有不可透水的背衬层，该背衬层一直在敷料顶部上延伸并向下延伸到伤口接触表面。

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The invention discloses an alloy coating bushing which comprises a steel backing layer, a substrate layer, a nickel grid layer and a friction-reducing layer which are sequentially arranged.

本发明公开了一种合金镀层轴瓦，包括依次设置的钢背层、基底层、镍栅层和减摩层。

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The substrate, which has an adhesive backing, is made slightly larger than the final flexible display and the debonding layer, so it stays steady on the glass.

拥有粘性背面的基板比最后制成的软性显示器和离形层略大，以便让它固定在玻璃板上。

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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