The term "extensive study" refers to a deep and thorough examination or exploration of a particular subject or topic. It suggests spending a significant amount of time and effort to gain a comprehensive understanding. Full definition
We also provide you with the best thinking in the field that is based on extensive study of salary negotiation dynamics. (aresumefortoday.com)
I've done extensive studies on both, and while I can't post all the research here, let me summarize my findings. (redeeminggod.com)
These days, although medicines only reach the clinic after extensive studies in animals and people, we still lack an appealing weight - loss pill. (newscientist.com)