Allowed are inlays of natural fibres and viscose only.
允许是镶嵌天然纤维和粘胶只.
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Natural fibres contain impurities in the form of oils, fats and waxes.
天然的纤维含有一些类似油和石蜡之类的杂质.
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Substitutions of human - made fibres have been made for natural fibres.
人造纤维代替品已取代了天然纤维.
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