"Apologize" refers to the "defense" in the Complete Works of Plato, which is Plato's record of Socrates' defense against the charges in court. There is no so-called quoted original document here, which is Mill's summary and comment on Socrates' accusation according to Apology in the Complete Works of Plato. If we must say the original document quoted, it is Apologize in the Complete Works of Plato.

The English version of "Defense" is an apology, and Chinese translation is generally translated into defense. But it can also be translated into defense and apology. But I think it is wrong to translate it into an apology. Because Socrates, including later scholars, never admitted that Socrates ungodly had corrupted the youth, the whole article defended itself on this ground, not apologizing at all. I don't know why Cheng Zhonghua translated Mill's On Freedom in this way.