human是單數形式。
Its rate of growth was fast — much more like that of an ape than that of a human.
它的發育速度很快——更像猿,而不像人。
human being單數,而human beings 複數
human being是有單複數的,如果是用複數human beings,那麼其單數是指一個人,複數表示多個人.如果指全人類,則只用單數即可。
例句:
robots can do some dangrous work instead of human being.機器人能代替人類做很多危險的工作。
It's us, human beings, we the people who create the society we want, not profit.是我們人類自己創造了我們想要的社會,而不是利潤。