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1. 把5L水桶裝滿倒進3L中，剩2L。586Please respect copyright.ＰＥＮＡＮＡFC7mc7ENKL
8964 copyright protection582ＰＥＮＡＮＡIVeeTMdbhp 維尼

2. 3L水桶倒空，2L從5L水桶倒過來後，把5L再次裝滿。586Please respect copyright.ＰＥＮＡＮＡ8iaa7W2fb4
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3. 再從5L水桶倒出1L到3L水桶，就OK了。586Please respect copyright.ＰＥＮＡＮＡoFxrf5diqW
8964 copyright protection582ＰＥＮＡＮＡ6JvD2o6TO3 維尼

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