Unverified90% confidenceDecision RuleTime unknown

U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

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Unverified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90% similar Unverified前部搭扣收紧设计能将枕头固定在颈部两侧，有效防止头部向前倾倒，这是区别于普通U型枕的核心功能优势。85% similar

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