human being还是human beings?

human being还是human beings? human being 后面用are还是is human呢? human being right? human being英语翻译 human being !是什么意思? human being怎么读 human human human human human Human human和human being有什么区别? human beings与human being的区别 people和human,human being的区别 human being和human加的谓语用单数还是复数? human的复数是humen 还是humanshuman 等于 human being 是可数的,后者的复数是 human beings ,那human呢? each human being用单数还是复数(is/are)?