| 单词 | nabla | 
| 释义 | nablanoun  nab·la   ˈnablə    plural -s   1   : an ancient stringed instrument probably like a Hebrew harp of 10 or 12 strings  called also nebel 2   [probably so called from the resemblance of its symbol, the inverted Greek delta, to a harp]  : del   | 
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