Unverified83% confidenceDecision RuleTime unknown
椅枕人体工学弧度应贴合颈椎前凸生理曲度（C形），中间凹陷深度2-4cm能托住后脑并顶住颈窝；纯平面或球面枕只顶后脑不托颈，长期使用反而加重颈部悬空
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