2, the buns are big, the stuffing is small, and the buns are tasteless.
3. Elephants are big, ants are small and elephants are light.
It is hot in summer, cold in winter, long in summer and short in winter.
A rhetorical device of contrast is used.
Compare two different things or situations. Yu Dafu's "Flower Dock": "However, the mud wall is inclined and the spider web is around the beam. Compared with the calligraphy and painting screen hanging on the wall, it will naturally give birth to the feeling that "pitching has become a thing of the past". "Qin Mu's Postscript on Collecting Shells from the Art Sea": "Any metaphor is only a little comparison, and the two can never be completely compared. "