Okay kiddo, imagine China is like a big puzzle and each piece of the puzzle is a different type of land or terrain. Like some puzzle pieces might be mountains and some might be flat plains.
Now, when we talk about physiographic macroregions of China, we're talking about grouping these puzzle pieces together based on what they look like and where they are in the country.
For example, one macroregion is called the Northeast China Plain. This is a big puzzle piece of flat land in the northeast part of China. Another macroregion is called the Tibetan Plateau. This puzzle piece is high up in the mountainous areas of southern China and is really big and flat on top.
There are eight of these physiographic macroregions in China, each one made up of different types of puzzle pieces. They help us understand how the land in China is different from place to place, and help scientists and other people who study the environment understand the geography better.