1961年，北京第二机床厂开始采用气体氮化淬火。

In 1961, the Beijing second machine tool plant began using gas nitriding quenching.

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但是清华大学、北京大学恐怕不能这样办，并不是所有大学都要走上海机床厂的道路。

But I'm afraid Qinghua and Beijing Universities can't be run along these lines. By no means should all colleges and universities follow the example of the Shanghai Machine Tool Plant.

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