There is about a trillion human cells that make each one of us who we are and able to do all the things that we do, but you have 10 trillion bacterial cells in you or on you at any moment in your life.
每个人体大约是由一兆个人体细胞所组成 它们让我们能完成各种各样我们想做的事情 但是，你一生中的每时每刻， 有大约十兆个细菌细胞生活在你的体内体表。