The deep-sea vent ecosystem hosts unique species that thrive in extreme conditions found nowhere else on Earth.
深海热泉生态系统孕育着独特的物种，它们在地球上其他地方无法找到的极端条件下繁衍生息。
Scientists believe this resilience stems from a unique protein that protects the tardigrade's cellular structures when water is scarce.
From a Central Ideas and Details question · Information and Ideas
Which choice best defines “unique”?
B — One of a kind, special. “unique” means one of a kind, special.
Which word means “one of a kind, special”?
A — unique. “unique” means one of a kind, special.
unique — one of a kind, special. In Chinese: 独特的，唯一的.
unique is pronounced /juˈniːk/.
The deep-sea vent ecosystem hosts unique species that thrive in extreme conditions found nowhere else on Earth. (深海热泉生态系统孕育着独特的物种，它们在地球上其他地方无法找到的极端条件下繁衍生息。)
distinctive, singular, exclusive — all close in meaning to unique (one of a kind, special).
common, ordinary — each the opposite of unique (one of a kind, special).
Yes. unique 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.
uni(one)+que(unique)