C771 The Research of Light.(2)

This class was indeed very interesting. From Su Rann's excited expression, it could be seen that Zhao Lei had indeed taught her some incredible things.

"Let's talk about Bai Zhan first. You said that you would feel uncomfortable if you don't take a sunbath." Zhao Lei said with a smile, "This is the effect of the ultraviolet rays Su Rann observed just now