I....has both advantages and

　　disadvantages.……既有利又有弊。例如：

　　1.Obviously television has both advantages and disadvantages.

　　2.Living in a city has both advantages and disadvantages.

　　3.Com pared with cars，bikes have their advantages and disadvantages.

　　舉一反三：

　　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.(本例將利弊分開講，轉(zhuǎn)折過渡自然。just as every coin has two sides也很值得背誦。)