Unverified85% confidenceDecision RuleTime unknown
叠加稳定性看盖面凹槽与底部脚位是否契合：真正模块化设计的收纳盒盖顶有下沉卡槽，上层盒底能嵌入，晃动位移＜2mm；纯平顶盖仅靠摩擦叠放，超过3层易倒塌
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