opposable
adjective anatomy specialized uk/əˈpəʊ.zə.bəl/ us/əˈpoʊ.zə.bəl/
与其他手指相对的
Opposable thumbs are thumbs that can be put opposite the fingers of the same hand, so that objects can be picked up and held.
All primates have opposable thumbs, so opposable thumbs are not unique to humans. 所有灵长类动物都有与其他手指相对的拇指，所以与其他手指相对的拇指并不是人类所独有的。