Focus on the pronunciation of thesis
English definition of “thesis”
/ˈθi·sɪs/ n [C] (plural theses /ˈθi·siz/)
› a piece of writing involving original study of a subject, esp. for a college or university degree: a master’s thesis › A thesis is also the main idea, opinion, or theory of a speaker or writer, who then attempts to prove it: His thesis was that World War I could have been avoided.