some people ......
据说这样的写法不地道,貌似很多都可以改为 it is ..... 十天里有谈到,网上也有文章提到过
It is imagined that...人们认为……
It can not be denied that...不可否认……
It will be seen from this that...由此可知……
It should be realized that...必须认识到……
It is (always) stressed that...人们(总是)强调……