同义词： leger line
以上来源于: WordNet
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]
Ledger lines or leger lines are short horizontal lines used to indicate notes that lie above or below the stave.
加线为较短的水平线，用以表明音调在五线谱之上或之下。
He'd never met Ledger before, so when Ledger arrived and performed he gave Caine such a fright he forgot his lines.
他之前从未见过希斯·莱杰，所以当莱杰达到后开始表演时，他的表现让凯恩被震慑到忘记了台词。
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