translation.en: And very soon after, the fossil record started yielding a very good idea of how many plants and animals there have been since complex life really began to leave a very interesting fossil record.
translation.zh: 不久之后，化石的历史记录开始产生 一个非常好的想法，那就是，自从人类复杂的生命 真正开始在化石历史上留名的时候 到底存在有多少植物和动物。