举一反三：
1．Although computers bring people a lot of convenience，they have many disadvantages．
2．．．．has many advantages．For example，．．．However，just as every coin has two sides，．．．has its disadvantages．（本例将利弊分开讲，转折过渡自然。just as every coin has two sides 也很值得背诵。）
II．．．．play（s）an important role ／part in．．．……在……中扮演重要角色／起重要作用。例如：
1．Computers play an important role in science and technology．
2．Computers play a more and more important role in our life．
Computers play an increasingly important role in our studies．
3．Education plays an important part in developing our mind．
4．Addiction to alcohol and drugs play a role in homelessness．
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