To illustrate the concept of gravity, the physicist dropped a feather and a hammer in a vacuum chamber.
为了说明重力的概念，物理学家在真空室里同时落下羽毛和锤子。
Which choice best defines “illustrate”?
A — To explain or make something clear by using examples or pictures. “illustrate” means to explain or make something clear by using examples or pictures.
Which word means “to explain or make something clear by using examples or pictures”?
B — illustrate. “illustrate” means to explain or make something clear by using examples or pictures.
illustrate — to explain or make something clear by using examples or pictures. In Chinese: 说明，阐明.
illustrate is pronounced /ˈɪləstreɪt/.
To illustrate the concept of gravity, the physicist dropped a feather and a hammer in a vacuum chamber. (为了说明重力的概念，物理学家在真空室里同时落下羽毛和锤子。)
demonstrate, explain, exemplify — all close in meaning to illustrate (to explain or make something clear by using examples or pictures).
confuse, obscure — each the opposite of illustrate (to explain or make something clear by using examples or pictures).
Yes. illustrate is on the SAT Prep Easy list — mid-frequency academic words that do get tested. 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.