The researchers said there are close ties between duck grazing patterns and rice cropping intensity.
研究员指出,放养鸭子和水稻栽种密度也有密切关联。
They looked at five variables: duck abundance, human population, chicken Numbers, elevation and rice cropping intensity.
他们考察了五个变数:鸭丰度,人口,鸡只数量,海拔高度和水稻种植密度。
Researchers reviewed three outbreaks in early 2004 through late 2005. They looked at five variables: duck abundance, human population, chicken Numbers, elevation and rice cropping intensity.
研究人员检查了2004年初到2005末的三次爆发,他们注意到了五个变化的因素:鸭子的多少,人类的人口,鸡的数量,海拔和稻米种植密度。
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