虚设的英文：
nominal

参考例句：

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是什么意思：
adj. 名义上的；微不足道的；票面上的
n. 名词性词

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。