Unverified85% confidenceDecision RuleTime unknown
踩踏石表面应有凸点或波浪纹理，凸点高度2-4mm既能防滑又不硌脚；纯平面或过深纹理（>6mm）赤脚踩踏易引起不适或反而积存脏物
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85%
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Long-term
Relevance
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