translation.en: Most people don't realize it, because they're invisible, but microbes make up about a half of the Earth's biomass, whereas all animals only make up about one one-thousandth of all the biomass.
translation.zh: 大多数人没有意识到这些肉眼看不到的生物 微生物构成了地球约一半的生物量 而所有的动物加起来 也才占地球生物量的千分之一