Imagine you live in a town and sometimes it gets too hot or too rainy outside. What if there was a group of special people who could try to change the weather and make it better?
Well, that's kind of like the Beijing Weather Modification Office. It's a group of people who work together to try and change the weather in Beijing, which is a big city in China.
Sometimes they want to make it rain more, so they might fly up into the sky in a special plane and drop little particles of salt to try and make the clouds bigger and rain more.
Other times, they might want to make it stop raining and make the sky clear up. In that case, they might use special equipment on the ground to shoot rockets up into the clouds to try and break them apart.
Now, it's important to note that the people who work in the Beijing Weather Modification Office can't control the weather completely - they can only try to help it along a little bit. It's kind of like they're playing a game with the weather and trying to win.
So next time you notice the weather acting a little differently than usual, remember that there are people out there who are trying to help make it better!