It is commonly believed that … / It is a common belief that … 人们一般认为……

 

Many people insist that … 很多人坚持认为……

 

With the development of science and technology, more and more people believe that…随着科技的发展,越来越多的人认为……

 

It's generally recognized that... 它普遍认为...

 

It's likely that ... 这可能是因为...