开头段：先讲重要性，然后转讲不好的地方。
中间段：措施
结尾段：先来个小转折再进入总结
开头段Nowadays with the rapid development of advanced ……., more and more….. are commonly and widely used in everyday life. However, what worries most of us is that……
中间段 Firstly….Secondly…..Lastly but in no means least……
结尾段 To conclude, …..are just like a double-edged sword. With them we may have less trouble dealing with problems in life and enjoy a better-off life. However, one point should be kept in mind that we should take sensible use of them , always being the master of them.
