demographer的复数形式怎么拼写？

Professor Antonio Golini is a demographer at the University of Rome.罗马大学安东尼奥教授是位人口统计学家....

n.人口统计学家...

demographer的音标：demographer的英式发音音标为：[dɪ'mɒɡrəfə(r)]demographer的美式发音音标为：[dɪ'mɒɡrəfə(r)]...