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Bacteria are the oldest living organisms on the earth.
細菌是地球上最古老的生物。
They've been here for billions of years, and what they are are single-celled microscopic organisms.
它們已經存在數十億年了，它們是單細胞微生物。
So they are one cell and they have this special property that they only have one piece of DNA.
它們特征是只有一個細胞，還有就是它們只有一份DNA。
They have very few genes, and genetic information to encode all of the traits that they carry out.
它們只有少量基因和遺傳信息，來編碼它們表達的特性。
And the way bacteria make a living is that they consume nutrients from the environment,
細菌生存的方法，是不斷從環境中吸取養分，
they grow to twice their size, they cut themselves down in the middle, and one cell becomes two, and so on and so on.
在成長到兩倍的體積后，它們從中一分為二，分裂為兩個細胞，如此循環。
They just grow and divide, and grow and divide -- so a kind of boring life,
它們不停得生長、分裂，然后再生長、再分裂--過著有點乏味的生活。
except that what I would argue is that you have an amazing interaction with these critters.
但是，今天我想告訴你，你與這些細菌有著驚人的互動關系。
I know you guys think of yourself as humans, and this is sort of how I think of you.
我知道你認為你自己是人類，而這可能也是我如何看你們的。
This man is supposed to represent a generic human being, and all of the circles in that man are all of the cells that make up your body.
在這里的是一個一般人類的代表，在他身上所有的圓圈代表著各個組成人體的細胞。
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,
每個人體大約是由一兆個人體細胞所組成，它們讓我們能完成各種各樣我們想做的事情，
but you have 10 trillion bacterial cells in you or on you at any moment in your life.
但是，你一生中的每時每刻，有大約十兆個細菌細胞生活在你的體內體表。
So, 10 times more bacterial cells than human cells on a human being.
所以，有十倍于人體細胞的細菌細胞生活在一個人身上。
And of course it's the DNA that counts, so here's all the A, T, Gs and Cs that make up your genetic code, and give you all your charming characteristics.
同理，我們要算一下DNA，這是所有的A, T, G和C(腺嘌呤, 胸腺嘧啶, 鳥嘌呤, 胞嘧啶)組成你的基因密碼, 賦予你所有的魅力特征。
You have about 30,000 genes. Well it turns out you have 100 times more bacterial genes playing a role in you or on you all of your life.
你有3萬左右的遺傳基因，而圍繞你的細菌的遺傳基因數量是你自己的100倍，它們在你的身體內部和表面上中始終扮演著重要的角色。
At the best, you're 10 percent human, but more likely about one percent human, depending on which of these metrics you like.
最樂觀的看法是: 你只是“10分之1人”, 事實上“100分之一人”更準確，取決于你更喜歡用哪個尺度來衡量。
I know you think of yourself as human beings, but I think of you as 90 or 99 percent bacterial.
我知道你自認為是一個“人類”，但在我眼里你是90%~99%的細菌。
