2：From what has been mentioned above, we can come to the conclusion that

　　3：Taking all these factors into consideration, we naturally/reasonably come to the conclusion that

　　4：Hence/Therefore, wed better come to the conclusion that

　　5:There is no doubt that has its drawbacks as well as merits.

　　6：All in all, we cannot live without,but at the same time we must try to find out new ways to cope with the problems that would arise.

　　四、提出建议

　　1：It is high time that we put an end to the .

　　2：There is no doubt that enough concern must be paid to the problem of

　　3：Obviously ,if we want to do something it is essential that

　　4：Only in this way can we

　　5：Spare no effort to + V

　　五、预示后果

　　1：Obviously，if we dont control the problem, the chances are thatwill lead us in danger.

　　2：No doubt, unless we take effective measures, it is very likely that

　　3：It is urgent that immediate measures should be taken to stop the situation

　　六、表示论证

　　1：From my point of view, it is more reasonable to support the first opinion rather than the second.

　　2：I cannot entirely agree with the idea that

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