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:
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