Already what were thought to be bacteria for generations have been found to compose, instead, two great domains of microorganisms: true bacteria and one-celled organisms the archaea, which are closer than other bacteria to the eukaryota, the group that we belong to.
过去科学家曾认定是细菌的生物 现在的发现则显示，它们实际上是由两种微生物组成的 即真细菌和单细胞的古细菌 它比其他的细菌更接近真核生物，人也是真核生物