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A doctoral thesis or piece of research is written or done in order to obtain a doctorate.
postgraduate
a doctoral student in mathematics.
一位数学专业博士生。
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。