Morphological characters and geographical distribution are the same as the family.形态学上的特征和地理的分布与科相同。
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。
In geographical terms, the sea bed can be divided into two or three quite distinct regions.按地理学的观点，海床可划分成二个或三个大不相同的区域。
