指出了在锌膏中加入金属铟作缓蚀剂不是公知常识；

And adding indium to zinc paste wasn't general knowledge .

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第二部分是公知技术抗辩原则与其他相关原则的比较。

Second, comparing the principle of the prior art and other correlative principles.

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最后，笔者对我国的公知技术抗辩制度提出了自己的一些建议。

Finally, the author puts forward his own proposals to our country's prior art counterplead system.

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