Eskimos use at most 12 different words for snows,which is not many more than English speakers and should be expected.
这里为何用is呢，代指前面的一句话吗？但比较对象后面不是English speakers吗？
Eskimos use at most 12 different words for snows,which is not many more than English speakers and should be expected.
=Eskimos use at most 12 different words for snows, and the figure is not many more than English speakers // and should be expected...
1, not many more than 因后面隐含的中心词是words，故用many. 这种many，是adj转adv的使用方法
2，为便于理解，than 一般都可看成是than what 或其缩合
