这张照片在美国国际开发署举办的2011年春季前线环境摄影比赛中荣获第四名。
This photo won fourth prize in USAID's spring 2011 Frontlines Environment photo contest.
2008年美国位居第一，自此以后一直在下降，去年降至第四名。
The US was in fourth place last year, after falling from No. 1 in 2008.
2008年美国位居第一，自此以后一直在下降，去年降至第四名。
The US was in fourth place last year, after falling from No. 1 in 2008.
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