Unverified83% confidenceFactTime unknown
填充材质选择：干沙密度约1.5g/cm³，碎石约1.6-1.8g/cm³，同体积碎石更重但棱角易磨破内袋；水填充最轻便（1g/cm³）但冬季会结冰、夏季易滋生异味
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83%
Confidence
Long-term
Relevance
-
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