新世纪商务英语综合教程3PDF

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内容简介

The last couple of centuries have seen an extraordinary stretching of our understanding of space and time. We can now look beyond the solar system, beyond our galaxy, beyond billions of other galaxies — back to the big bang that initiated the universe we know. As for time, we can look beyond the last thousand years, beyond the beginnings of civilization, beyond the patch of warmth in the last 12,000 years, beyond the many spasms of the ice ages, beyond the multicellular, eukaryotic organisms, and further back still10 over more than 3 billion years to the origins of life itself.

eukaryotic / ju:ˌkærɪ'ɒtɪk/a. of or relating to an organism consisting of a cell or cells in which the genetic material is DNA in the form of chromosomes contained within a distinct nucleus 真核生物的