The instructions for assembling the telescope were so opaque that even experienced astronomers struggled to follow them.
组装望远镜的说明如此晦涩难懂，以至于经验丰富的天文学家也难以遵循。
Which choice best defines “opaque”?
D — Not transparent or translucent; hard to understand or explain. “opaque” means not transparent or translucent; hard to understand or explain.
Which word means “not transparent or translucent; hard to understand or explain”?
B — opaque. “opaque” means not transparent or translucent; hard to understand or explain.
opaque — not transparent or translucent; hard to understand or explain. In Chinese: 不透明的; 难以理解的.
opaque is pronounced /oʊˈpeɪk/.
The instructions for assembling the telescope were so opaque that even experienced astronomers struggled to follow them. (组装望远镜的说明如此晦涩难懂，以至于经验丰富的天文学家也难以遵循。)
cloudy, murky, obscure — all close in meaning to opaque (not transparent or translucent; hard to understand or explain).
transparent, clear — each the opposite of opaque (not transparent or translucent; hard to understand or explain).
Yes. opaque 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.
opa(opaque, unclear)+que(forms adjectives) → opaque.