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1. 把5L水桶裝滿倒進3L中，剩2L。559Please respect copyright.ＰＥＮＡＮＡ6QbEYlP8Sq
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2. 3L水桶倒空，2L從5L水桶倒過來後，把5L再次裝滿。559Please respect copyright.ＰＥＮＡＮＡFSEZkZrPtx
8964 copyright protection555ＰＥＮＡＮＡ5MbaZmbGqv 維尼

3. 再從5L水桶倒出1L到3L水桶，就OK了。559Please respect copyright.ＰＥＮＡＮＡN5EOCk2Lmc
8964 copyright protection555ＰＥＮＡＮＡa96Jwi16jr 維尼

3.21.35.63