Both Chinese words mean the root of a roof-a roof built on a building to prevent rain. People can't go up. Roof-the roof of some high-rise buildings, a flat place where people can walk. That means people can go up. That is to say, the roofs of Japanese-style houses (such as Jia) living at home are all called "roof roots", while the roofs of Japanese-style buildings (office buildings and schools) can be obtained from above and are called "roofs", "roof roots" and "roofs".