Other great shifts, such asclimate change and ecological disasters, have a certain progression andbuilt-in adjustment periods, but contact between humankind and aliens can occurat any time.
其它重大转变，比如气候变化和生态灾难，总有一个确定的进程和固定的调节时间。 但人类和外星人的接触可以发生在任何时间。
Therefore, responding to the climate change required the reasonable adjustment of agriculture structure, scientific utilization of water resources and protection of the ecological environment.
因此，应对气候变化要合理调整农业结构，科学利用水资源，保护生态环境。
E. ecosystem from its ecological elements, system balance, system adjustment, aiming to offer reference for the large system of P.
从可获得的资料来看，从生态学的角度出发，把体育作为一种生态系统进行研究，国内还较为鲜见。
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