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dissertations
A dissertation is a long formal piece of writing on a particular subject, especially for an advanced university degree.
thesis
He is currently writing a dissertation on the Somali civil war.
他正在写一篇关于索马里内战的论文。
For his doctoral dissertation he investigated fossil land snails.
他的博士论文研究了陆地蜗牛化石。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。