Unit 4 Fun with science 课文英汉对照阅读-2021-2022学年高中英语牛津译林版（2020）选修第一册

Unit4 Fun with science Reading The human microbiome: an invisible microuniverse 人类微生物群系:一个看不见的微宇宙 What organisms live with us, make up about two per cent of an adult's body mass, yet are invisible to the naked eye? They are the estimated 39 trillion microorganisms living in and on our body, like bacteria and viruses, which compose the human microbiome! 什么生物和我们共生，约占成年人体重的2%，而肉眼却看不见?它们是生活在我们体内和体表的约39万亿个微生物，比如细菌和病毒，它们构成了人类微生物群系!不过没必要恐慌，因为它们大多数都是对健康有益的。尽管极其微小，这些微生物会以巨大的意想不到的方式影响我们的身心。 But there is no need to panic, for most of them are there to keep us healthy. Even though incredibly small, these microorganisms influence our body and mind in big unexpected ways. So, where do these microorganisms come from? Well, they have always been a part of us. Our very first birthday gift-three quarters of the essential microorganisms we need to survive and grow-is from our mother when we are born. By the time we reach two years old, we have our very own personal collection of microorganisms that refle