给出原因:

This phenomenon exists for a number of reasons. First, Second, Third,

这一现象的存在是有许多原因的.首先，;第二,，;第三，

Why did ? For one thing ，for another . Perhaps the primary reason is

为什么会?一个原因是，令一个原因是;或许其主要原因是

I quite agree with the statement that The reasons are chiefly as follows.

我十分赞同这一论述,即，其主要原因如下: