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2. It is generally /usually accepted /agreed/recognized that ----普遍认为 3. It is believed that -----有人相信 4. It is well-known that ----大家知道 5. It is said that ----据说 6. It is learned that ---据闻 7. It is supposed that----据推测 8. It is estimated/predicted/calculated that---据估计 13. It will be seen from this that ----由此可见 14. It is understood that----不用说 15. It can not be denied that---无可否认 16. It has been proved/demonstrated that---已经证明 17. It may be confirmed that ----可以肯定 18. It may be safely said that----可以有把握地说 19. It is sometimes asked that---人们有时会问 20. It is expected that/hoped that----人们希望 21. When it comes to ------要说到,要谈及 | 
