it should be realized that

宜宾学院外国语学院英语写作 ... It will be seen from this that… 由此可知… It should be realized that… 必须认识到… ...

... It is calculated that… 据计算 It should be realized that… 我们应该认识到 It is pointed out that… 有人指出，人们指出 ...

... 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 ...