ledger line
柯林斯词典
1. N a short line placed above or below the staff to accommodate notes representing pitches above or below the staff (记录高于或低于五线谱音域的)加线[music]
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1. N a short line placed above or below the staff to accommodate notes representing pitches above or below the staff (记录高于或低于五线谱音域的)加线[music]