in the back ground：在后面；在幕后的，不公开的；在不引人注目的地方。例句：There is classical music playing in the background.背景里有古典音乐在播放。
in the back ground例句
1.In the background was that eternal hum.
背景里是那没完没了的哼哼声。
2.I kept hearing the sound of applause in the background.
我不断听到背景音中有掌声。
3.In the background, in soft focus, we see his smiling wife.
在背景的柔焦中，我们看到他微笑的妻子。
4.There was a scuffling noise in the background, which turned out to be mice.
背景中有窸窸窣窣的噪声，原来是有老鼠。
5.He prefers to remain in the background and let his assistant talk to the press.
他喜欢待在幕后，让他的助理向新闻界发布消息。