说明情况 现象:The answer to this problem involves many factors.The factors that contribute to this situation includeWe may blamebut the real causes areBut the fundamental cause is thatPerhaps the primary factors is thatOne of the most common factors/cause is thatPart of the most explanations for it is thatThe change inlargely results from the fact thatThe phenomenon mainly stems from the fact that A number of factors might contribute to /lead to/account for the phenomenon /problem.A number of factors are accountable for this situation后果（最后一段句首）:It may give rise to a host of problems.The immediate result it produces isIt will exercise a profound influence uponIt consequence can be so great that两者比较:The advantages of A are much greater than those of B.It is reasonable to maintain thatbut it would be foolish to claim thatLike anything else, it has its faultsA bears some resemblances to BA and B differ in several ways.People used to thinkbut things are different now.Evidently, it has both negative and positive effects.However the same is not applicable to B.A and B has several points in common.For all the disadvantages it has its compensating advantages.A maybe preferable to B, but A suffers from the disadvantage thatThe advantage far outweigh the disadvantages.批驳 反对；It is true that,but one vital point is being left out.There is a grain of truth in these statements, but they ignore a more important fact.Some people saybut it dosent hold water.Many of us have being under the illusion thatA close examination would reveal how ridiculous that statement is.It makes no sense to argue forToo much stress placed onthe assumption thatContrary to what is widely accepted, I maintain that.举例；A good case in point isAs an illustration , we may takeSuch examples might be given easily.is often cited as an example.证明；No one can deny the fact thatThe idea is hardly supported by facts.Unfortunately, none of the available data showsRecent studies indicate thatThere is sufficient evidence to show thatAccording to statistics proved by,it can be seen that 开篇；Many nations have been faced with the problem ofRecently the problem has been brought into fcous .Recently the phenomenon has become a hated topic.Recently the issue has aroused great concern among.Nowdays there is a growing concern overNever in our history has the idea that ,been so popularFaced with ,quite a few people argue thatAccording to a great survey, With the rapid development of结尾；From that has been discussed above , we can draw the conclusion that.It is high time that strict measures were taken to stopIt is necessary that steps should be taken toIn conclusion , it is imperative thatThere is no easy method , but . might be of some help.To solve the above-mentioned problem , we must In summary , if we continue to ignore the above-mentioned issue , more problem will crop up .With the efforts of all parts concerned , the problem will be solved thoroughly .We might do more that identify the cause , it is important to take actions to Taking all this into account , we Whether it is good or nor positive or negative , one thing is certain clear