I will conclude by saying… 最后我要说…。Therefore.we have the reason to believe that…因此，有理由相信…。All things considered，总而言之 It may be safely said that…它可以有把握地说……。Therefore.in my opinion.it’s more advisable…因此，在我看来，更可取的是…。From what has been discussed above.we may safely draw the conclusion that…通过以上讨论，可以得出结论…。