《尚书·夏书·禹贡》
这里的土是疏松的黑土，这里的田是第七等，赋税是第八等，还杂出第七等和第九等。
厥土青黎，厥田惟下上，厥赋下中，三错。
The soil here is loose black soil, this field is the seventh level, the tax is the eighth level, and it also has the seventh level and the ninth level.