随着城市的扩张，原来农村或城市周边的河流变成了市内河流。
As cities expand outward, rivers that used to be in rural or peri-urban areas become urban rivers.
多数人间病例发生在农村或城市周边地区，那里的居民喂养小型场院禽群，使人类能够密切和持续地接触来自受感染禽鸟的病毒。
Most human cases have occurred in rural or peri-urban areas where households keep small backyard flocks, allowing close and continuing human exposure to virus from infected birds.
在2008年的某个时候，可能是亚洲或非洲的某个人做出了从农村搬到城市的决定。
At some point in 2008, someone, probably in either Asia or Africa, made the decision to move from the countryside to the city.
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