科技大爆炸

1 英语原意

复数：Complex Number

2 英文解释

2.1 complex adjective

1) involving a lot of different but related parts

由许多相关的不同部分组成的；构造复杂的

2) difficult to understand or find an answer to because of having many different parts

难懂的，费解的; 错综复杂的

2.2 What is a Complex Number?

A Complex Number is a combination of a Real Number and an Imaginary Number.

When we combine a Real Number and an Imaginary Number we get a Complex Number:

Examples: 1 + i , 39 + 3i, 0.8 − 2.2i ,−2 + πi

Complex does not mean complicated.It means the two types of numbers, real and imaginary, together form a complex, just like a building complex (buildings joined together).

3 中文解释

形如a+bi（a、b均为实数）的数为复数，其中，a被称为实部，b被称为虚部，i为虚数单位。复数通常用z表示，即z=a+bi，当z的虚部b＝0时，则z为实数；当z的虚部b≠0时，实部a＝0时，常称z为纯虚数。

4 感想体会

复数 Complex，“复”指的是复杂的意思，相对实数和虚数来说，复数的构造更复杂一点，所以叫复数。