Human being are natural enemies of marine mammals. 什么意思?

Are you human being?RT human being 后面用are还是is human呢? Human being are natural enemies of marine mammals. 什么意思? Human being are exploiting natural resource.为什么不用is? each human being用单数还是复数(is/are)? human being还是human beings? human being right? human being英语翻译 human being !是什么意思? human being怎么读 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 beings are human beings 我们不要上学!用英语怎么说You are no human being at all! 当human being表示人类时 用human being造句 being VS human beings 区别! fellow human being什么意思