noun
background
/'bækgraund/
background 是什么意思
背景，背景资料，后台
A person's social heritage: previous experience or training the part of a scene (or picture) that lies behind objects in the foreground information that is essential to understanding a situation or problem extraneous signals that can be confused with the phenomenon to be observed or measured.
词性
noun
难度
进阶
页面用途
检索复习