background signal

n. 本底信号, 背景信号

例句与用法：

It is wrong to differentiate between people according to their family background.

根据出身不同而区别待人是不对的。

She came from a privileged background.

她出身於特权阶层。

With my working-class background I feel like a fish out of water among these high-society people.

我出身于工人阶级,在上流社会中感到很不自在。

He had the idea of shooting them against a complete plain white background.

他有个主意，以纯白为背景给他们拍摄。

He has a working-class background.

他是工人阶级出身。

He stayed in the background to escape from the public attention.

他呆在幕后为了避开公众的注意。