pure number

英 美
  • 纯数
  • number n.号码;数量;数字v.总计;编号;编号;把...算作
  • pure adj.纯的;纯洁的;纯粹的
    1. The specific gravity of a material is the ratio of its density to that of water and is therefore a pure number.
      物质的比重指的是物质的密度与水的密度的比值,所以是纯数。