Unverified85% confidenceTradeoffTime unknown
保温保冷性能与瓶口大小、开盖便捷度矛盾：真空保温壶瓶口小、盖结构复杂开盖慢；大口直饮壶清洗方便开盖快但几乎无保温能力
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85%
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Long-term
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