1:Itiswell-knowntousthat……(我们都知道……)==Asfarasmyknowledgeisconcerned,…(就我所知…)
2:Recentlytheproblemof……hasbeenbroughtintofocus.==Nowadaysthereisagrowingconcernover……(最近……问题引起了关注)
3:Nowadays(overpopulation)hasbecomeaproblemwehavetoface.(现今,人口过剩已成为我们不得不面对的问题)
4:Internethasbeenplayinganincreasinglyimportantroleinourday-to-daylife.Ithasbroughtalotofbenefitsbuthascreatedsomeseriousproblemsaswell.(互联网已在我们的生活扮演着越来越重要的角色,它给我们带来了许多好处但也产生了一些严重的问题)
5:Withtherapiddevelopmentofscienceandtechnology,moreandmorepeoplebelievethat……(随着科技的迅速发展,越来越多的人认为……)
6:Itisacommonbeliefthat……==Itiscommonlybelievedthat……(人们一般认为……)