The professor expounded the theory of plate tectonics, illustrating each stage with diagrams of continental drift.
教授详细阐述了板块构造理论，并用大陆漂移的图解说明了每个阶段。
Which choice best defines “expound”?
A — To explain in detail.. “expound” means To explain in detail..
Which word means “To explain in detail.”?
D — expound. “expound” means To explain in detail..
expound — To explain in detail.. In Chinese: 详细说明；阐述.
expound is pronounced //ɪkˈspaʊnd//.
The professor expounded the theory of plate tectonics, illustrating each stage with diagrams of continental drift. (教授详细阐述了板块构造理论，并用大陆漂移的图解说明了每个阶段。)
elaborate, explain, clarify — all close in meaning to expound (To explain in detail.).
summarize, condense — each the opposite of expound (To explain in detail.).
Yes. expound is on the SAT Prep Difficult list — the higher-register words that decide the hard questions. The Digital SAT does not test vocabulary in isolation; words like this one are tested through Words in Context questions, where you choose the word that completes a passage most logically and precisely.
ex(出) + pound(放置) → 摆出道理。