开头
1) Many nation have been faced with the problem of ...
2) Recently the problem ha been brought into focu.
3) Recently the phenomenon ha become a heated topic.
4) Recently the iue ha aroued great concern among ...
5) Nowaday there i a growing concern over ...
6) Never in our hitory ha the idea that ... been o popular.
7) Faced with ..., quite a few people argue that ...
8) According to a recent urvey, ...
9) With the rapid development of ..., ...
结尾
1) From what ha been dicued above, we can draw the concluion that ...
2) It i high time that trict meaure were taken to top ...
3) It i neceary that tep hould be taken to ...
4) In concluion, it i imperative that ...
5) There i no eay method, but ...might be of ome help.
6) To olve the above-mentioned problem, we mut ...
7) In ummary, if we continue to ignore the above-mentioned iue, more problem will crop up.