nowadays, there are more and more (某种现象) in (某种场合). it is estimated that (相关数据). why have there been so many (某种现象)? maybe the reasons can be listed as follows. the first one is (原因一). besides, (原因二). the third one is (原因三). to sum up, the main cause of (某种现象) is due to (最主要原因). it is high time that something were done upon it. for one thing, (解决办法一). on the other hand, (解决办法二). all these measures will certainly reduce the number of (某种现象).

　　现象说明文

　　    recently _______, what amazes us most is______________, it is true that__________. there are many reasons explaining__________________________. the main reason is________________.

　　what is more_________. thirdly_____. as a result____________.considering all there,____________.for one thing_____,for another____.in conclusion______________.