* She earned a doctorate in astrophysics from Harvard University. (This is a straightforward statement about someone's achievement.)
* The professor's doctorate in linguistics was crucial to his research on language acquisition. (This highlights the importance of the doctorate.)
* After years of hard work, he finally achieved his lifelong dream of obtaining a doctorate. (This sentence focuses on the journey and fulfillment.)
* A doctorate is a highly respected academic qualification that requires extensive research and study. (This is a definition of the term.)
Which sentence best suits your needs depends on the context you're writing in.