1, Mountain Fire Observer: Wake up in the morning light every day, sit in front of the house alone and watch the sunrise, go out for a walk alone, and listen to the mountains, the wind and Lin Yu alone.
2. Polar weather station: There is only one person in the whole station, working alone in the polar flood.
3. Rangers in nature reserves: In the untouched virgin forest M, while enduring endless silence, they silently guard the forest.