Examples of using It is the only in English and their translations into Polish
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Colloquial
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Official
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Medicine
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Ecclesiastic
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Ecclesiastic
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Financial
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Official/political
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Programming
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Computer
It is the only venomous dragon.
There are moments when it is the only good thing you can do.
It is the only such system in Poland.
This cathedral is notable since it is the only Norwegian cathedral made of wood.
It is the only surviving tour-reduit in Malta.
People also translate
It is the only such lake in Lithuania.
It is the only such detector in the world.
It is the only viable form of interstellar travel.
It is the only periodic waveform that has this property.
It is the only known Apabhraṃśa grammar.
It is the only early 1900s building left standing.
It is the only remaining station in the town.
It is the only such reactor currently in operation.
It is the only listed building in the commune.
It is the only remaining covered bridge in Franklin County.
It is the only arcaded commercial building in Brookline.
It is the only surviving house of these originals.
It is the only functioning Jewish theatre in Poland.
It is the only known case involving an alien claimant.
It is the only known dipterous predator of barnacles.
It is the only Polish university in the organization.
It is the only Protestant magazine that is sold abroad.
It is the only international airport in the Abruzzo region.
It is the only mountain-toucan with a white throat.
It is the only such institution in southwest China.
It is the only hallig that does not have a terp for dwelling.
It is the only major river in Guyana which flows from North to South.
It is the only biographical museum of Maria Skłodowska-Curie worldwide.
It is the only such course in Poland and one of the few in Europe.
It is the only public engineering college in France specialized in automotive.