Wèilán de dàhǎi zài yángguāng xià shǎnshǎn fāguāng.
The azure sea glitters in the sunlight.
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蔚蓝 is a literary, poetic word for blue. It evokes depth and brilliance - the blue of a clear sky or deep ocean. More vivid and elevated in register than the ordinary word 蓝色.
