不过，在一个地理上易守难攻的地区，几乎没有人敢排除故事出现意外转折的可能性。
Yet, in an area whose geography has inspired improbable intervention from outsiders, few will dismiss the chance of unexpected twists in the story.
其中的一个意外后果可能是改变诸如疟疾之类的寄生虫引发的疾病的地理分布。
One of the side effects may be to change the geographical distribution of parasitic diseases such as malaria.
分散的过程很缓慢，这取决于气候与地理的变迁，取决于意外的偶发事件。
The process of diffusion would often be very slow, depending on climatal and geographical changes, on strange accidents.
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