这些决定不得不在高失业率的背景下做出。

These decisions have had to be taken against a ___background of high unemployment.

你能给我一些关于这个情况的背景信息吗？

Can you give me some ___background on the situation?

故事的背景是20世纪30年代初美国南部一个小镇的生活。

The ___background of the story is life in a small town in one of the southern states of the USA in the early 1930s.