喀斯特山洞里很凉快。 喀斯特山洞里很涼快。 喀斯特山洞里很涼快。

It is nice and cool inside the karst caves.

Simplified
喀斯特山洞里很凉快。
Traditional (Taiwan)
喀斯特山洞里很涼快。
Pinyin
Kāsītè shāndòng lǐ hěn liángkuai.
Bopomofo
ㄎㄚ ㄙ ㄊㄜˋ ㄕㄢ ㄉㄨㄥˋ ㄌㄧˇ ㄏㄣˇ ㄌㄧㄤˊ ˙ㄎㄨㄞ。

Written with HSK 3 vocabulary, at CEFR level A2.

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