Every Chinese school child knows that this was an oath of brotherhood taken by three brave-hearted men in the Romance of the Three Kingdoms, a semi-historical epic set in the third century. Some translators explain this background with a footnote, but we prefer to inject the information into the translation in a concise way.
例如，桃園三結義，有些翻譯會加註釋，解釋典故的來源，但我們會想辦法用最簡潔的字句，在翻譯中稍加解釋。