《梦溪笔谈·讥谑》
防风氏的身体宽九亩，高三丈，按周代的度量标准，一亩宽六尺，九亩就是五丈四尺，照此算来，防风氏的身体就像一块饼一样了。
防风氏身广九亩，长三尺，姬室亩广六尺，九亩乃五丈四尺，如此防风之身，乃一饼餤耳。
According to the legend, Fang Feng's body was nine mu wide and three zhang high; according to the measurement standards of the Zhou Dynasty, one mu was six尺 wide, and nine mu was 54尺, so by this calculation, Fang Feng's body is like a flatbread.