discuss: implies sifting of possibilities by presenting considerations of pros AND cons: ~ the need for widening the expressway.


argue: implies an often heated offering of reasons and evidences in support of convictionS ALREADY held: ~ the project would be too costly.


debate: sug. a formal or public argument between opposing parties: ~ the merit of the proposed constitution amendment.  


dispute: implies a contentious and heated argument: scientists ~ the reason for the extinction of the dinosaurs.


discuss讨论: 考虑利弊-->过滤各种可能性, argue争论: 激烈提出理由证据-->支持已有观点，debate辩论: 对立双方正式公开的argument，dispute争端: 激烈争吵的argument


记忆方法: 1）首字母联想，DADD==>DA DiDi大弟弟爱争论


         2）程度不同，第二个词往后都是argument争论，激烈程度递增。

         3） 讨论的意思是论述某事mean to discourse about something in order to reach conclusions or to convince others of the validity of one's position.