Let the guardian of the murals share secrets of heritage protection and tell you about how people use their knowledge and actions to ensure this common heritage of mankind will last.

Protecting the Dunhuang murals is a race against time. Wu Fasi and his team are a part of this race. [Photo/chinadaily.com.cn]

Wu said that mural protection is actually a huge project, not only for restoration, but also for many scholars of various disciplines who are working hard on it. [Photo/chinadaily.com.cn]

Wu and his team are monitoring the real-time concentration of air microorganisms in the cave. [Photo/chinadaily.com.cn]

They also need to monitor the real-time concentration of suspended particulate matter in the air and collect samples of air microorganisms. [Photo/chinadaily.com.cn]

There are many claw marks from birds in the eye of the mural. [Photo/ chinadaily.com.cn]

Residual plant roots are seen on the wall of the Mogao Grottoes. [Photo/chinadaily.com.cn]