According to Baidu Library Test Network, Mother Swallow smiled. In the vegetable garden, melons lie on the ground and eggplant hangs on the branches. Under the eaves, the swallow's mother asked the swallow, "Can you fly to the vegetable garden to see the difference between winter melon and eggplant?" So, the swallow observed the melon and eggplant under the guidance of her mother.

The swallow's mother let the swallow see the melon and eggplant three times. The first time she showed it to the swallow, she wanted to see the difference between melon and eggplant. The requirement for the swallow to look at it for the second time is to see what is the difference between melon and eggplant; The requirement of the swallow's third look is to look carefully to see if there is any difference; Mother Swallow has different requirements every time, because Swallows can learn to observe things.