虚设的英文：
nominal

• Base line: Imaginary horizontal line on which characters in a line of type appear to stand.
  基线:虚设的水平线。所有字符在视觉上都齐列在它之上。
• Axis: An imaginary dividing line around which design elements are located.
  轴线:一条虚设的分界线，利用它来确定设计单元的摆放位置。

• nominal addendum
  标称齿顶高
• He is nominated as police chief.
  他被任命为警察局局长。
• The charge of the box lunch was nominal.
  午餐饭盒收费很少。
• Let‘s nominate a date for the race.
  我们给比赛定个日期吧。
• He could not realize their nominal closeness.
  他没法儿想得出来，他们名义上那样近的关系会是真事。