To describe words or actions that are out of date or inappropriate for the current situation, often implying a lack of adaptability or being out of touch with modern trends.
他总是喜欢在会议上提出过时的方案，真是古调单弹，没有人会采纳的。
He always brings up outdated proposals in meetings, which is truly out of touch with the current situation; no one will adopt them.
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