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1. 把5L水桶裝滿倒進3L中，剩2L。635Please respect copyright.ＰＥＮＡＮＡzfxdKtCoPC
8964 copyright protection631ＰＥＮＡＮＡTfSj52JLct 維尼

2. 3L水桶倒空，2L從5L水桶倒過來後，把5L再次裝滿。635Please respect copyright.ＰＥＮＡＮＡlQhaI5AYMh
8964 copyright protection631ＰＥＮＡＮＡEqOfnRLuJq 維尼

3. 再從5L水桶倒出1L到3L水桶，就OK了。635Please respect copyright.ＰＥＮＡＮＡaDtWTfSulL
8964 copyright protection631ＰＥＮＡＮＡuH9USGNuEi 維尼

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