虚数的英文：
imaginary number; unreliable figure

参考例句：

The mathematical formulation of the quantum theory has required the use of imaginary numbers.
量子理论的数学公式需要运用虚数。

It shows that any zero must be pure imaginary.
它证明任何的零点必须是纯虚数。

We have to distinguish between the propagating modes with real valued , and the evanescent modes with imaginary
我们必须分别考虑具有实数β的导模和具有虚数β的消失模。

imaginary是什么意思：
adj. 想像中的；虚构的；幻想的；虚数的

Something unreal,insubstantial,or imaginary.
幻想不真实，不实在，或被想象出来的某个事物

A meridian is an imaginary circle.
子午线是假想出来的一个圆圈。

Can you imagine an imaginary menagerie manager imagining managing an imaginary menagerie?
你可以想象一个虚构的野生动物园经理幻想自己管理一个虚构的野生动物园吗？

number是什么意思：
n. 数；号码；算数
v. 给…编号；计算，数

The number was fifty.
该数字为五十。

There is safety in numbers
人多势众

It was an irrational number.
这是一个无理数。

unreliable是什么意思：
adj. 不可靠的

She has proved herself unreliable.
她的表现说明她靠不住。

They are two of a kind and totally unreliable.
他俩是同类货色，都是不可靠的人。

I shall prove to you that the witness is quite unreliable.
我将向你证明，证人十分不可靠。