butitsappearance/existencederivesfromavarietyoffactors)。

(用于原因分析类议论文)

7)Theprogress/improvement/change(s)in……is(are)reallytr emendous/remarkable/prodigious/marvelous，soitisnecessarytounderstand(see)whatit(they)illustrate(s)/p rove(s)/account(s)for.(用于原因分析类议论文和知识性说明文)

8)Acomparisonbetweenthesechangesmaybeagoodwaytolearnmore about……(可用于对比说明文)

9)Moreinsight/inspiration/truth/thoughtcanbededucedfromt hesechanges.(可用于知识性说明文)

10)Thissituation/phenomenon/trend/tendencyisratherdistre ssing/disturbing/depressing/heart-rending，fortheoppositeofitisjustinlinewithourwishes/justwhatistobee xpected.(可用于分析建议、批驳分析和原因分析等议论文)

11)Inthatcase，however，Ipreferto……ratherthan……(用于理由陈述、比较分析、批驳分析类议论文和知识性说明文)

12)Thisiswhatweareunwillingtosee，sosomewaymustbefoundoutto……(可用于分析建议、对比分析、批

驳分析类议论文和知识性说明文)

13)Fortunately，however，

moreandmorepeoplecome/begintorealizethat……(可用于分析建议、对比分析和各抒己见类议论文)

14)Unfortunately，

thingshaveworsened/come/developedtothepointwhere……(用于分

析建议、原因分析、批驳分析、各抒己见类议论文和知识性说明文)

15)Buthaveyoueverstoppedtothinkwhat/how/why……?(可用于

除理由陈述之外的各种议论文和知识性说明文)