Unverified88% confidenceDecision RuleTime unknown

长途飞机/大巴选U型颈枕，且开口应偏向下巴前方（可旋转设计），防止睡着时头部前倾磕下巴；纯圆环形U型枕对下巴前倾几乎无支撑

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UnverifiedU型充气枕适合坐姿颈部固定（飞机/大巴），支撑下巴防止头部前倾；长方形/波浪形充气枕适合平躺当床枕，两者不可混用，买错场景等于无效90% similar Unverified长途飞机/大巴选U型闭合式颈枕（前颈开口小），前颈支撑高度15-20cm可托住下巴防止头部前倾；短途或办公室午睡选可180度弯折的开放式或马蹄形90% similar Unverified长途飞机/大巴选U型颈枕需下巴不前倾：填充物应在颈后两侧饱满支撑（下颌托高度≥8cm），太薄的会让头前倾导致落枕89% similar

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