共生起源 meaning in English

symbiogenesis

There is now strong evidence that chloroplasts and other cell organelles , such as mitochondria , represent prokaryotic organisms that invaded heterotrophic eukaryotic cells early in evolution and are now part of an indispensable symbiotic union ( see endosymbiont theory )
这恰恰是现在有关叶绿体及一些其他的细胞器如线粒体是被原始的真核细胞吞噬进细胞内，与宿主长期共生而逐渐演化出独立单元的内共生起源学说的重要证据。