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1. 把5L水桶裝滿倒進3L中，剩2L。578Please respect copyright.ＰＥＮＡＮＡe02JjLevWY
8964 copyright protection574ＰＥＮＡＮＡsFt7eCscXP 維尼

2. 3L水桶倒空，2L從5L水桶倒過來後，把5L再次裝滿。578Please respect copyright.ＰＥＮＡＮＡw5kmTbfM8C
8964 copyright protection574ＰＥＮＡＮＡtK15LFHQis 維尼

3. 再從5L水桶倒出1L到3L水桶，就OK了。578Please respect copyright.ＰＥＮＡＮＡaPrLMlCSUN
8964 copyright protection574ＰＥＮＡＮＡffTQklN3yd 維尼

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