ruler/ˋrulɚ; ˈruːlə/n [C]1 someone such as a king who has official power over a country 统治者2 a flat narrow piece of plastic, wood, or metal that you use for measuring things and drawing straight lines 尺﹐直尺see picture at见 CLASSROOM 图
rulerrulerrulersnoun1a long piece of plastic, metal or wood that you use for drawing straight lines or for measuring things2a person who rules a country