to strike a discordant note
...戏 to get into confrontation; 唱反调 to express an opposing view; to sing an opposite tune; to strike a discordant note; to contradict 唱高调 to sing the high part; to speak fine sounding but empty words (idiom) ..
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to strike a discordant note
发出不和谐的音符
以上为机器翻译结果，长、整句建议使用 人工翻译 。