The process of diffusion would often be very slow, depending on climatal and geographical changes, on strange accidents.
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.
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。
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