可數，background的基本意思是“背景”、“底色”，主要指圖畫或照片中在主要人物或景象之後起襯托作用的部分。引申可表示“人的背景資料”，主要包括家庭、所屬社會階層、經歷、學歷狀況等。還可表示“背景情況”，指事情發生時所處的時間、地點和外部環境等。
background例句
1、He has a strong political background.
他有強大的政治背景。
2、It is wrong to differentiate between people according to their family background.
根據出身不同而區別待人是不對的。
3、With my working-class background I feel like a fish out of water among these high-society people.
我出身於工人階級,在上流社會中感到很不自在。
4、Though his background was modest, it was in no sense deprived.
盡管他家境壹般，但也並不算貧窮。
5、Like a chameleon, he could merge unobtrusively into the background.
他就像壹條變色龍，可以神不知鬼不覺地隱藏在背景中間。
6、In the background, in soft focus, we see his smiling wife.
在背景部分，我們可以看到他妻子面帶微笑的蒙影像。