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againstthebackgroundof中的"against"为什么不用in/under呢?Onemorereasonnottolosesleepovertheriseinoilpricesisthat,unliketherisesinthe1970s,ithasnotoccurredagainstthebackgroundofgeneralcommodity-priceinflationand

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against the background of中的"against"为什么不用in/under呢?
One more reason not to lose sleep over the rise in oil prices is that,unlike the rises in the 1970s,it has not occurred against the background of general commodity-price inflation and global excess demand.
在这句话中,against the background of中的“against”为什么不用in/under呢?
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以...为背景