masthead的复数形式怎么写？

n.桅顶，报头vt.升至桅顶...

masthead的音标：masthead的英式发音音标为：['mɑ:sthed]masthead的美式发音音标为：['mæsthed]...

We carry illustrations of these medals on our masthead.我们在报头刊登这些奖章的图片。Earpieces: Small advertisements on either side of a newspaper's masthead.耳位广告: 在报纸版头两边的细小广告.The bark was dressed with masthead flags only.那条三桅帆船只...