B2 being the only existing one of its type or, more generally, unusual, or special in some way獨一無二的;與衆不同的;唯一的;獨特的;罕見的
More examples
The exhibition is a unique opportunity to see her later work.
A unique feature of these rock shelters was that they were dry.
Fingerprints are unique to every individual.
This is a unique opportunity to hear Mr Maitland speak in person.
This problem is not unique to learners of English.
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