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In a sentence
Zajtra má byť polojasno.
Tomorrow it should be partly cloudy.
Ráno bolo polojasno a chladno.
The morning was partly cloudy and cold.
Pri polojasne sa dobre chodí na túru.
It is good to hike when it is partly cloudy.
Popoludní sa vyjasnilo na polojasno.
In the afternoon it cleared to partly cloudy.
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Hand-reviewed example sentences.
Full attribution on References.