HSK 7-9
口哨儿
kǒushàor名
whistle (made with the mouth)
远处突然传来清脆的口哨儿。
Yuǎn chù tū rán chuán lái qīng cuì de kǒu shàor.
A clear whistle suddenly came from the distance.
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Appears across levels (7-9) in the HSK 3.0 word list.