研究人过去一直认为，只有原核生物和原生生物这样的单细胞生物才能够在深海的缺氧环境中生存。
Researchers had thought that only single-celled organisms such as prokaryotes and protozoa could live in the oxygen-deprived environments of the deepest ocean.
有些浮游植物是细菌，有些是原生生物，而大多数则是单细胞植物。
Some phytoplankton are bacteria, some are protists, and most are single-celled plants.
原生生物是靠不是细菌为生单细胞微生物，但是研究声称有时候细菌可以存活下来并且反噬原生生物。
Protozoa are unicellular microorganisms that feed on bacteria, and sometimes the bacteria survive and replicate within the protozoa, the study claims.
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