endosymbiont theory

例句：

1. 1. The endosymbiotic theorysuggests that certain bacteria can live inside thecells of other organisms.
   内共生论理论认为某些细菌可以生活在其他生物的细胞内。
2. 2. This endosymbiotic theory hasbeen supported by numerous studies and observations.
   这一内共生论得到了大量研究和观察的支持。
3. 3. Theendosymbiotic theory is still a topicof debate among scientists due to its complexityand the lack of direct evidence.
   由于其复杂性和缺乏直接证据，内共生论仍然是科学家争论的话题。