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The love story unfolds against a background of civil war.

这爱情故事以内战为背景展开。

《牛津词典》

Her hair floats like a banner in the breeze and in the early morning light she seems to glow against a background of dark trees.

她的头发像在微风中的旗帜一样飘动，在清晨的晨光中，她似乎在黑暗树木的映衬下闪闪发光。

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However, this was happening against a background of very high oil prices and cheap foreign credit.

BBC: Viewpoint: Russia's economy needs to reform

These problems came against a background of years of contentious negotiations between Motorola and Teledesic.

FORBES: Why Craig Couldn't Catch a Falling Star

Against a background like this, a little waywardness in the world of macroeconomics seems entirely forgivable.

ECONOMIST: Wynne Godley, British economist, died on May 13th, aged 83