而旱地的这一比例则更高，原因是政策不当和畜牧业管理不足，导致荒漠化蔓延。

This figure is even higher in the drylands where inappropriate policies and inadequate livestock management contribute to advancing desertification.

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我们的现代不良生活方式是个必然因素导致肥胖，但并不是致使我们整体人口数量中肥胖人口快速蔓延的全部原因。

Our modern lifestyle is thus a necessary, but not a sufficient, condition for the high prevalence of obesity in our population.

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合法或非法的家禽交易活动既是导致病毒蔓延的原因之一，也是2004年H5N1病毒在东南亚持续播撒的原因之一。

This commercial scenario is the one that explained the expansion and the maintenance of the H5N1 virus in south-east Asia until 2004, via the legal and illegal trade in poultry.

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