It must be realized that …我们必须意识到……

　　预示后果:

　　Obviously, if we don't control the problem, the chances are that … will lead us in danger.

　　很明显,如果我们不能控制这一问题,很有可能我们会陷入危险.

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

　　毫无疑问,除非我们采取有效措施,很可能会……

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

　　很紧迫的是,应立即采取措施阻止这一事态的发展.

　　From my point of view, it is more reasonable to support the first opinion rather than the second. 在我看来,支持第一种观点比支持第二种观点更有道理.

　　I cannot entirely agree with the idea that …我无法完全同意这一观点……

　　Personally, I am standing on the side of …就个人而言,我站在……的一边.

　　I sincerely believe that …我真诚地相信……

　　In my opinion, it is more advisable to do … than to do ….

　　在我个人看来,做……比做……更明智.

　　Finally, to speak frankly, there is also a more practical reason why …

　　给出原因:

　　This phenomenon exists for a number of reasons. First, … Second, … Third, …

　　这一现象的存在是有许多原因的.首先，……;第二,，……;第三，……

　　Why did …? For one thing …，for another …. Perhaps the primary reason is…

　　为什么会……?一个原因是……，令一个原因是……;或许其主要原因是……

　　I quite agree with the statement that … The reasons are chiefly as follows.