human being的复数形式怎么拼写？

human being的音标：human being的英式发音音标为：['hju:mən 'bi:ɪŋ]human being的美式发音音标为：['hjumən 'biɪŋ]...

n.人类...

Physical perfection in a human being is exceedingly rare.体貌完美的人极为罕见。Watch any young human being, or any other young animal.注意儿童或其他幼小动物。He didn'treally believe that any human being could read another's mind.他并不真...