求翻译：它经历了三个发展时期：第一个时期是微生物克隆时期，即用一个细菌可以很快复制出成千上万个和它一模一样的细菌，从而变成一个细菌群；第二个时期是生物技术克隆时期，比如用遗传基因一DNA进行克隆；第三个时期是动物克隆时期，即由一个细胞克隆成一个动物。克隆绵羊“多利”就是由一头母羊的体细胞克隆而来，使用的便是动物克隆技术。是什么意思？

It has gone through three periods: the first cloning of a time period microorganisms, a bacterium that can quickly replicate it exactly the same, and thousands of bacteria, and thus became a group of bacteria; the second period of biotechnology cloning period, such as a DNA with genetic cloning; thi

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It has undergone three development period: is microbial clones during the first period, that is, with a bacteria can quickly copy the thousands and is identical to that of bacteria, thus becoming a bacteria group; be biological clone during the second period, such as cloning genomic DNA; is animal c