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否定段的主题句：
① However (Nonetheless/ Nevertheless/ But), there are some disadvantages of owing a private car/ Every coin has two sides.
② While enjoying the convenience that private cars bring us, we should not ignore the problem they create/ produce/ introduce/ make.
③ Despite/ In spite of/ For all the advantages, they brings their own disadvantages/ problems/ negative effects
④ Like anything else, private cars also have their own weakness/ limits.
⑤ However, private cars are not without shortcomings/ faults.
⑥ Yet other speak of the problems private cars have brought. They complain that......
⑦ However, private cars may also bring with it problems our society had not previously faced.
⑧ Despite the increase in efficiency and convenience generated by private cars, the changes they bring could very well lead to potentially adverse consequences.
否定段的分论点：
① 占有空间 On the one hand, private cars take up/ occupy too much space.
② 交通事故 On the other hand, a driver should be careful/ cautious while driving, otherwise, car accidents are more likely to happen.
③ 污染环境 What's more/In addition, private cars give off/ discharge/ release CO which pollute the environment/ air.
注意：所谓上义词是指抽象、概括和笼统的，就是比较superordinate的词;而下义词就是具体的东西，即subordinate的东西。
