求翻译：输送带上下覆盖胶目前多采用天然橡胶,国外有采用耐磨和抗风化的橡胶的胶带，如轮胎花纹橡胶的改良胶作为覆盖胶,以提高其使用寿命。输送带的中间用合成橡胶与天然胶的混合物。是什么意思？

Cover up and down the conveyor belt rubber currently use more natural rubber, foreign tape wear and weathering resistance of rubber such as tire tread rubber modified plastic as the plastic cover, in order to improve its service life. The conveyor belt in the middle with a mixture of synthetic rubbe

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About the conveyor belt covers the rubber to use the natural rubber at present, overseas has uses wear-resisting and goes against the wind the rubber adhesive tape, like the tire tread rubber improvement rubber took the cover rubber, enhances its service life.Conveyor belt among uses the synthetic r

With natural rubber conveyor belt cover compound present, foreign used rubber belt for wear resistance and resistance to weathering, such as improved rubber cover compound for tire tread rubber to improve its service life. Conveyor belt with a mixture of natural rubber and synthetic rubber.

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