A shorter drought in which they exhausted their stored food supplies might already have gotten them in deep trouble, because growing crops required rain rather than reservoirs.
一场持续时间较短的干旱耗尽了他们的粮食储备，而这可能已经让他们陷入了困境，因为种植农作物需要降雨，而不是水库。
Rainforests have their own perfect system for ensuring their own survival; the tall trees make a canopy of branches and leaves which protect themselves, smaller plants, and the forest animals from heavy rain, intense dry heat from the sun and strong winds.
雨林有自己完善的系统来确保自身的生存；高大的树木有枝叶形成的树冠层来保护自身，树冠也保护着矮小的植物以及动物不受暴雨、酷暑及强风的侵扰。
Even ecosystems, such as tropical rain forests, which don't have variable rainfall, also have patch dynamics due to periodic storms and tree falls.
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。
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