黑暗的宇宙背景衬托出星云的美丽。

The dark ___background of space highlights the beauty of the nebula.

他的商业背景帮助他在新工作中表现出色。

His business ___background helped him excel in the new job.

在这个政治动荡的背景下，公司决定推迟新产品发布。

The company decided to postpone the new product launch against the ___background of political unrest.

咖啡馆里播放着轻音乐作为背景音乐。

The café played gentle music in the ___background.