Again, we think that bacteria invented that, and you've just evolved a few more bells and whistles, but all of the ideas are in these simple systems that we can study.
再一次，我们认为细菌发明了这个机制， 你只不过是多演化出了一些铃铛与哨子而已， 但是所有的概念都包含在这个我们所研究的简单系统中。