世界上数亿人口仰赖定期季风带来的降雨进行农业耕作，但历史上季风的行踪却反复无常。
Hundreds of millions of people depend on regular monsoon rains to nourish their crop, but the monsoons are historically capricious.
甚至生态系统，比如热带雨林，没有可变的降雨量，但由于定期下暴雨和减少树木，该地带有了变化的内在动力。
Even ecosystems, such as tropical rain forests, which don't have variable rainfall, also have patch dynamics due to periodic storms and tree falls.
没有足够的降雨定期地支持全部森林在这个地区。
Not enough rain falls regularly to support full forests in these areas.
没有足够的降雨定期地支持全部森林在这个地区。
Not enough rain falls regularly to support full forests in these areas.
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