thesis          
noun [ C ] uk/ˈθiː.sɪs/ us/ˈθiː.sɪs/  theses uk/ˈθiː.siːz/ us
B2 论文
a long piece of writing on a particular subject, especially one that is done for a higher college or university degree
  a doctoral thesis (= for a PhD) 博士论文 
 C2 formal论题,命题;论点 
the main idea, opinion, or theory of a person, group, piece of writing, or speech
  Their main thesis was that war was inevitable. 他们的主要论点是战争不可避免。 
 - More examples
 - I wrote my thesis on literacy strategies for boys.
 - Her main thesis is that children need a lot of verbal stimulation.