She spent two years writing her thesis on environmental science.
Она потратила два года на написание своей диссертации по экологической науке.
Definitions
A thesis is a formal academic document that presents the author's research and findings on a specific topic, typically submitted as part of a degree requirement. It includes a clear statement of the research question, a review of relevant literature, a description of the methodology used, and an analysis of the results, culminating in conclusions that contribute to the field of study.