... Course overview 课程概述 Stages of the System Evolution 系统进化的阶段 Laws of the Technical System Evolution 技术系统进化法则 ...
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蜂窝系统的进化经历了四个主要阶段，或者说代。
Cellular systems have evolved in four major phases or generations.
动物经过数亿年的进化直到脊椎动物阶段出现了渐为完整的免疫系统。
The immune system was not developed until in vertebrates during millions years of animal evolution, and the coevolution of interacting plants and microbes has given rise to the plant defense system.
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