crewman的复数形式怎么拼写

crewman的音标：crewman的英式发音音标为：['kru:mən]crewman的美式发音音标为：['kruːmən]...

To investigate the effect of environmental magnetic field upon crewman's physiological indexes during synchronous mine sweeping.探讨了扫雷艇同步扫雷时环境磁场对艇员某些生理检查指标的作用....

n.船员，乘务员，机组成员...