The telescope serves a dual purpose, allowing astronomers to observe distant galaxies and track near-Earth asteroids with equal precision.
这台望远镜具有双重用途，使天文学家能够以同样的精度观测遥远的星系和追踪近地小行星。
Which choice best defines “dual”?
A — Having two parts. “dual” means having two parts.
Which word means “having two parts”?
D — dual. “dual” means having two parts.
dual — having two parts. In Chinese: 双重的，两部分的.
dual is pronounced /ˈduːəl/.
The telescope serves a dual purpose, allowing astronomers to observe distant galaxies and track near-Earth asteroids with equal precision. (这台望远镜具有双重用途，使天文学家能够以同样的精度观测遥远的星系和追踪近地小行星。)
double, twofold, twin — all close in meaning to dual (having two parts).
single, singular — each the opposite of dual (having two parts).
Yes. dual 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.
dual (two)