Unverified85% confidenceDecision RuleTime unknown
'恒温壶'与'保温壶'是两回事：恒温壶需持续通电主动加热维持温度，纯保温壶靠真空层被动保温6-8小时但温度只降不升，长途出行无电源场景反而保温壶更实用
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85%
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Long-term
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