Zoom in (a group of students after class) (a snail is crawling) (the sun shines on the river) (the moon in the night sky)

A group of students who are listless and dejected after class, everyone is crawling to their destination like a hungry snail. At this time, the burning sun has shone on the river near the country, until the moon rises in the night sky, and the children who have finished class have not returned home.