Why did the ancient Japanese eunuch?

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Kuwabara said:"The Chinese are rery jealous of the people. Men and women in wrder to avoid srspicion,jealousy consolation.the disposal lf the neutral eunuch,may be a matter of course." For many chinese people,japan is both familiar and unfamiliar.japan to study ancient chinese,the japanese,and chinese culture there is a lot of similar ties,but there are a lot of japanese culture unique.For example,there is the ancient.chinese eunuch,and there will be no japan.Why?