backgrounds

They were filmed against a background of dark fir trees.

在一片黑黝黝的冷杉的映托下，他们被摄入了电影镜头。

If you listen carefully to this piece of music, you can hear a flute in the background.

如果你仔细听这首曲子，可以听到伴奏的笛声。

These decisions have had to be made against a background of high unemployment.

因为失业率高企，只好采取这些措施。

The book provides background information on the history of the region.

本书提供了有关该地区的历史背景信息。