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请教一个问题:
Prep中的一个句子
[size=10.000000pt](24511-!-item-!-188;#058&001020)
[size=10.000000pt]Organized in 1966 by the Fish and Wildlife Service, the Breeding Bird Survey uses annualroadside counts along established routes for monitoring of population changes of as many as,or of more than 250 bird species, including 180 songbirds.
[size=10.000000pt]
这句句子当中annual roadside counts along established routes到底是什么意思?因为这里看不懂,第一次做这道题是也没有办法判断表达目的的to monitor。
多谢!
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