n.自养生物
名词autotroph的复数形式.
The nitrifying bacteria are chemosynthetic autotrophs. 硝化细菌是化能合成的自养生物。
The cells were probably anaerobic heterotrophs, with autotrophs arising much later. 最早出现的细胞可能是厌氧异氧生物，自养生物很久后出现。
