Unverified75% confidenceTradeoffTime unknown
抽气快慢与效果的权衡：吸尘器抽气快但压缩不够密实、易残留空气回弹，手泵慢但可反复补抽达到更彻底的真空，追求长期存放选手泵更稳定
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75%
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Long-term
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