Unverified80% confidenceDecision RuleTime unknown
伞面直径与遮阴效果直接相关：单人遮阳伞面直径建议≥90cm（弯柄可到105cm），折叠伞展开直径≥95cm才能有效遮住肩背，过小的伞面防晒意义有限
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Unverified伞面直径与遮盖：折叠伞标注的'伞面直径'（沿伞骨量）通常比实际水平遮盖直径大30-40%，单人用有效遮盖需伞骨直径≥100cm，双人需≥110cm。选购时勿被'超大伞面'宣传直接误导。93% similarUnverified有效遮阴范围看伞面弧长和展开直径而非标称尺寸，直伞遮阴直径通常＞100cm适合多人或需遮全身，折叠伞多在70-90cm仅够遮头肩92% similarUnverified伞面直径（非伞骨长度）决定遮挡面积：单人用需≥98cm，双人需≥105cm，折叠伞往往标注膨胀后直径偏大，实际有效遮挡区约为直径的70%91% similarUnverified单人遮蔽选伞面直径≥100cm（对应伞骨长度约55-58cm）；双人共用需直径≥120cm；号称'大'的伞需看开伞后实测直径而非伞骨长度89% similarUnverified伞面直径与收纳长度成反比时代价大：直径>105cm的大伞面能挡雨充分但收纳后往往超过25cm，塞不进小包，超轻胶囊伞收纳仅15-18cm但伞面直径通常＜90cm仅够单人87% similar
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