音变复数 mutated plurals
复变函数 Functions of Complex Variables ; complex function ; Complex Variables
单复变函数 Functions of a Complex Variable
复变数 complex variable
复变函数论 [数] Complex Function Theory ; Complex Analysis
复变数法 complex variable method
复变函数与积分变换 Complex Function and Integral Transform ; Complex Function and Integral Transformation
复变函数法 method of complex function
变成复数形式 Plural forms
但英语其实很简单：基本没有动词变位，名词变复数很容易(大多数情况下只用加字母“s”)，而且无需记忆词性。
But English is pretty simple: verbs hardly conjugate; nouns pluralise easily (just add "s", mostly) and there are no genders to remember.
当指定Z为复数变元时，就有了形式幂级数的“变换”函数，即闭合形式的问题。
When Z is assigned the meaning of a complex variable, problem of "closed form" of formal power series emerges.
名词词组复数变化的规则就是：变“重点词”。
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