口哨儿kǒushàorwhistle (the small instrument or the sound produced)HSK 7-9PronunciationkǒushàorExample sentence裁判用口哨儿示意比赛开始。cáipàn yòng kǒushàor shìyì bǐsài kāishǐ.The referee used a whistle to signal the start of the game.Read and choose an answerOne fixed sampleExplore a sample