Functional languages get their name from the concept that programs should behave like mathematical functions; in other words, given a set of inputs, a function should always return the same output.

函数语言的名称源于这样一种概念：程序行为应该像数学函数一样；换句话说，给定一组输入，函数应始终返回相同的输出。

youdao

Functional languages rely on first-class functions (functions that can appear anywhere any other language construct can appear) as parameters and return values. Figure 3 illustrates this concept.

函数式语言依赖于一等函数(可在任何其他语言结构可能出现的地方出现的函数)作为参数和返回值。

youdao

A functional index can return any standard SQL type except for large objects.

除大型对象外，函数索引可以返回任何标准sql类型。

youdao

"Because I believe that it's an essential part of health care, and we're able to affect so strongly people's abilities to return to work and lead functional lives, we're an important part of the pie, " says Cheryl Resnik, assistant professor at the University of Southern California and president of the California Physical Therapy Association.

FORBES: 6. Physical Therapist