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1. 把5L水桶裝滿倒進3L中，剩2L。626Please respect copyright.ＰＥＮＡＮＡmLeLuzy62S
8964 copyright protection622ＰＥＮＡＮＡ26uE83g4Cd 維尼

2. 3L水桶倒空，2L從5L水桶倒過來後，把5L再次裝滿。626Please respect copyright.ＰＥＮＡＮＡWE4llSXt35
8964 copyright protection622ＰＥＮＡＮＡubjirfYf99 維尼

3. 再從5L水桶倒出1L到3L水桶，就OK了。626Please respect copyright.ＰＥＮＡＮＡQryNEmGss9
8964 copyright protection622ＰＥＮＡＮＡtkMFKABWaS 維尼

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