The picture shows the police officers from the Tuotuohe Police Substation at the source of the Yangtze River carrying out ecological environment protection activities. 　

The picture shows the police using drone technology to patrol the line and observe the dynamics of the surrounding ecological environment in real time.

In the stories of the police officers at the Tuotuohe Police Station, they are like tree roots, silently extending beneath the frozen soil, supporting the prosperity of life above the surface. Their protection is related to the flight of a falcon, the purity of a drop of water, the integrity of a grassland, and more importantly, to the inescapable mission of humans as guardians of nature.