Now, I want to move to the third theme of this lecture, which is invention.
现在，我将转向本课的第三个主题，那就是发明。
What do you think is the third most useful invention?
你认为第三个最有用的发明是什么？
The third part is about the comparative study on inferior invention.
第三部分，改劣发明的比较研究。
The third part is about the comparative study on inferior invention.
第三部分，改劣发明的比较研究。
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