2. First, fill the Tian Zi bucket, that is, the bucket with larger capacity.

3. Then pour the water from Tian Zi bucket into Tian Zi bucket. At this time, the capacity of 7 liters and 3 liters of water will have 4 liters of water.

4. Then empty the word bucket.

5. Pour Tian Zi bucket into Tian Zi bucket, and the capacity of 4 liters of water and 3 liters of water will produce 1 liter of water.

6. Then empty the bucket.

7. Pour the sky bucket into 1 liter of water in songkhla bucket.

8. Then fill the Tian Zi bucket with 7 liters of water.

9. At this time, pour the Tian Zi bucket into the Di Zi bucket. When it is full, there is 1 liter of water, which is 7-(3- 1)=7-2.

10, at this time, the task requirement of 5 liters of water was completed.

1 1, the following mechanism is also a similar solution. If it's too much trouble, just click on the violent smash.