Unverified75% confidenceDecision RuleTime unknown
折叠隧道靠弹簧张力弹开，收纳时需拧成8字压平，标注'可折叠'但未标明弹簧圈数/收纳直径的产品要谨慎，收纳后直径应≤全展开长度的1/3才算真正省空间
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75%
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Long-term
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