弧函数的英文：
arc function
n. 弧（度）；弧形物；天穹；弧光
v. 形成拱状物；形成电弧；走弧线
piercing by electric arc
电弧穿孔
The beach swept around in an arc.
海滩呈弧形伸展开来。
The secant of the complement of a directed angle or arc.
余割有向角的余角或弧的余割
An electric arc is struck by contacting the electrodes.
接触电极便击出电弧。
A rainbow arced gracefully over the town.
彩虹在小城上空画出了一道优美的弧线。
n. 官能，机能；功能；职责，职务；函数
v. 工作；活动；运转，运作；起作用
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。