大学英语六遥写作经典的替换词：原因　　原因 　　1.
A number of factors are accountable for this situation.
　　A number of factors might contribute to the phenomenon.
　　2.
The answer to this problem involves many factors.
　　3.
The phenomenon mainly stems from the fact that.
.
.
　　4.
The factors that contribute to this situation include.
.
.
　　5.
The change in .
.
.
largely results from the fact that.
.
.
　　6.
We may blame .
.
.
,but the real causes are.
.
.
　　7.
Part of the explanations for it is that .
.
.
　　One of the most common factors is that .
.
.
　　Another contributing factor is .
.
.
　　Perhaps the primary factor is that 　　But the fundamental cause is that