It has been found that…实践证明…
It has been illustrated that … 如图所示
It has been proved that … 已经证明
It is agreed that…人们同意…
It is alleged that … 据说
It is asserted that … 有人主张 ……
It can be said without exaggeration that … 可以毫不夸张地说
It can not be denied that…不可否认…
It is assumed that … 假定，假设
It is believed that … 有人认为……
It is calculated that … 根据计算
It is claimed that … 据说，有人主张
It is considered that … 人们认为，据估计
It is demonstrated that … 据证实，已经证明
It is estimated that…据估计…
It is generally considered that … 大家(一般人)认为
It is hoped that … 希望……
It is imagined that…人们认为…
It is learned that … 据说，已经查明
It is noticed that … 有人指出，人们注意到
It is proposed that … 有人提出
It is reported that … 据报道……
It is reputed that … 人们认为，可以认为
It is rumored that … 听说，传言
It is said that … 据说……
It is sometimes asked that … 人们有时会问
It is still to be hope that … 我们仍然希望
It is suggested that…有人建议…
It is supposed that … 据推测……
It is unanimously agreed that … 大家一致同意
It is universally accepted that … 人们普遍认为
It is well known that … 大家知道(众所周知)……
It is（always）stressed that…人们（总是）强调…
It is（generally）considered that…大家（普遍）认为…
It may be said without fear of exaggeration that … 可以毫不夸张地说……
It must be admitted that … 必须承认……
It must be pointed out that … 必须指出……
It should be realized that … 我们应该意识到
It was felt that … 有人认识到了
It was first intended that … 最初的设想是
It was noted above that … 前面已经指出
It will be seen from this that … 由此可见……
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