双重职能的英文：
dual function

His dual role as composer and conductor.
他兼作曲家及指挥的双重身分。

Dual-color fruit coffee
双色水果咖啡

Dual moisture detection probes to eliminate false alarms
双重防潮保护的探针能够避免警报失灵或误报

This dual tug is apparent in the whole movement of expatriation
这种两面周旋的态度在整个寄居海外运动中极为明显。

Dual to the bad weather, I did not test.
由于坏天气，我没有测得结果。

function requester
功能请求者

norm functional
范数泛函

The divergence of a vector function is the scalar function
矢量函数的散度是一个标量函数。

A functional is a kind of function where the dependent variable is itself a function.
泛函就是自变量本身为函数的一数函数。

The frequency response function includes an aerodynamic transfer function
频率的主函数包括主动力传递函数。