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can see clearly that great changes have taken place in … from…to… 第二句:The first … years saw… 第三句:The last … years witnessed … 第二段只寫四句: 第一句:What has caused this problem? It seems to me that there are … reasons. 第二句:Firstly, … 第三句:Secondly,… 第四句:Finally,… 第三段只寫四句: 第一句:How to solve the problem has bee a hot issue among many people. 第二句:For one t