bridgehead的复数形式怎么写？

A bridgehead was established.滩头阵地建立起来了。Bridged bicyclooctanes gave no significant bridgehead substitution.桥二环辛烷不给出有意义的桥头取代.The Analysis and Preventive Measures of Bump Reason at Bridgehead.桥头跳车原因分析及预防措施....

bridgehead的音标：bridgehead的英式发音音标为：['brɪdʒhed]bridgehead的美式发音音标为：['brɪdʒˌhɛd]...

n.桥塔，桥头堡...