第三段： (举例)
第一句： In addition to this …
替换句型：1. Equally importantly , …
2. further and even more importantly ,
3. even more disturbing , is
4. secondly and more importantly , though , in order to …, it is essentialthat …
第二句：for example ,
替换句型： 1. one particularly good example of this is …
2. one particularly salient example of this is
第三句： …
第四段：(反方观点)
第一句：It is also true that …(反方观点)
替换句型：1. However , perhaps the strongest argument in favor of …is that …
2. Yet , perhaps the strongest argument in favor of …is that …
第二句：if …(极端，特殊情况下的一些合理性，进一步说明该段第一句话)
第三句：however ,
替换句型：however , this is unlikely to occur while …
第五段：(结论)
第一句：by way of conclusion , I once again reaffirm my position that …because…
第二句： Although they are by no means insurmountable , it is highly unlikelythat they will be resolved in foreseeable future .
结尾补充句型：
1. It , therefore , demands our further consideration .
2. Given the seriousness of the problems that it causes , I believe thatthis should be the ultimate goal.
3. therefore , it is clearly in our own interests to do sth.