[KongchangAI]
Unverified82% confidenceFactTime unknown

填充材质优选铁砂/钢砂>天然河沙>普通细沙:铁砂密度高、体积小重量足、不易漏;细沙长期使用会因摩擦变粉末从缝线渗出,且遇潮结块

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82%
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