Why can a weather airship hover?

There are power facilities. The main function of weather airship is to test the weather. In fact, the weather airship is a balloon. It looks like an airplane and is equipped with power facilities. It can move in the air or hover at a fixed point. An airship is actually a lighter aircraft than air. The principle that it can fly in the air is similar to that of a hot air balloon, but the biggest difference from the hot air balloon is that the weather airship has a device to promote and control the flight state, and because the airship airbag is filled with a large number of gases with an average density lower than air, mostly hydrogen or helium, it can lift the airship off by buoyancy, and the control device can artificially control the flight height.