Three of the cases they studied found that the rise of West Nile virus in the U.S. corresponded to decreases in bird population density.

他们在研究过的三个案例中发现西尼罗河热在美国的的流行与鸟类种群密度的下降相关。

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If the Nile yields simple, raw materials, the inspiration of its people gives rise to one of the most perfumed, flavorsome and colorful cuisine in North Africa.

如果尼罗河只提供简单的原料，北非人就会把它们变成美味佳肴。

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Last year saw a slight rise, but most tourists go to the beach resorts of the Red Sea, staying away from Nile Valley sites like Luxor.

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