unknown function的用法和樣例：
例句
- On the first problem of a class of the second order parabolic systems of two variables and two unknown functions.
一類(lèi)二階兩個(gè)自變數兩個(gè)未知函數的拋物形方程組的第一問(wèn)題。 - A very simple method is to uselinear interpolation, which assumes that the unknown function is linear between every pair of successive points.
一個(gè)非常簡(jiǎn)單的方法是使用線(xiàn)性插值，它假定未知函數的線(xiàn)性每對之間的連續點(diǎn)。
