Straws are widely utilized in paper mills in China. During the production, a lot of straw residues are produced, which will result in environmental pollution and be fire-hazardous.
我国造纸行业广泛采用草类制浆造纸，生产过程中会产生大量麦草废弃物，既污染环境，又易引发火灾。
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As there was no evidence that hazardous waste was buried at the mine, investigators speculate that the source of dioxins may be natural, perhaps due to a prehistoric forest fire.