Explanation: Days edge: the natural opportunity. Old men and women that God became man and wife is the cooperation. Also refers to what is a coincidence. Source: Element stone chapter "Listening to the Zither bamboo dock" Marriage is the day of the fourth folding edge which make do. " Examples: Because he was the one thing I'm embarrassed to ask someone else. Now meet her sister, really ~, ask my sister advice. (Qing Cao Xueqin's "Dream of Red Mansions," the sixty-third back)