Based on the summary of internal research situation and the condition that we posses, the key problem and development thinking of domestic PTA technology were discussed.
在总结国内研究状况和所具备的条件基础上,论述了PTA技术国产化的关键问题及其开发思想。
To start out I'm going to go back to the thinking about development a little bit, embryonic development, and show you a picture here.
作为这节课的开始,我先稍微回顾一下,一些关于发育过程的内容,先说胚胎发育,这里有张图
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