An aerial photo of the Optics Valley Square at the East Lake High-tech Development Zone -- also known as Optics Valley of China -- in Wuhan, the capital city of Central China's Hubei province, taken on March 15. As spring arrives, trees and grass have turned a lush green. However, as the epidemic is not over, the once busy Optics Valley is still relatively quiet. Experts say that as sure as spring comes after winter, Wuhan and China will eventually usher in a victory against the epidemic. [Photo/Xinhua]