The telescope's primary mirror must focus light precisely to produce a clear image of distant galaxies.
望远镜的主镜必须精确地聚焦光线，才能产生遥远星系的清晰图像。
The essay begins by conceding that automation has increased efficiency in manufacturing, but the majority of the text focuses on documenting the loss of institutional knowledge that occurs when experienced workers are replaced by machines.
From a Text Structure and Purpose question · Craft and Structure
The essay opens by acknowledging that social media has connected distant friends and family in unprecedented ways, but the bulk of the essay focuses on documenting its effects on attention span and in-person social skills.
From a Text Structure and Purpose question · Craft and Structure
A magazine feature on a small fishing village opens with a wide aerial description of the entire coastline, then narrows its focus to a single family's boat and daily routine, before ending with a return to the wide coastal view at sunset.
From a Text Structure and Purpose question · Craft and Structure
Which choice best defines “focus”?
A — Concentrate, center. “focus” means concentrate, center.
Which word means “concentrate, center”?
B — focus. “focus” means concentrate, center.
focus — concentrate, center. In Chinese: 集中，焦点.
focus is pronounced /ˈfoʊkəs/.
The telescope's primary mirror must focus light precisely to produce a clear image of distant galaxies. (望远镜的主镜必须精确地聚焦光线，才能产生遥远星系的清晰图像。)
concentrate, center, centralize — all close in meaning to focus (concentrate, center).
distract, scatter — each the opposite of focus (concentrate, center).
Yes. focus is on the SAT Prep Basic list — the everyday academic words the SAT assumes you already have. 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.
focus (concentrate)