halfpenny的复数形式怎么写？

halfpenny的音标：halfpenny的英式发音音标为：['heɪpnɪ]halfpenny的美式发音音标为：['heɪpnɪ]...

His opinion is not worth a halfpenny.他的意见毫无价值.Not a halfpenny the worse.毫不逊色,一点也不差.Turn up again like a bad halfpenny.来得不是时候....

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