has a significant role in our daily life. generally, its advantages can be seen as follows. first ----------------(ａ的优点之一). besides -------------------（ａ的优点之二）.

　　but every coin has two sides. the negative aspects are also apparent. one of the important disadvantages is that ----------------(ａ的第一个缺点)．to make matters worse,------------------(ａ的第二个缺点)．

　　through the above analysis, i believe that the positive aspects overweigh the negative ones. therefore, i would like to ---------------(我的看法)．

　　(from the comparison between these positive and negative effects of a, we should take it reasonably and do it according to the circumstances we are in. only by this way, ---------------(对前景的预测)

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