It means progressive relationship. A gentleman is knowledgeable, while Japanese participants help themselves. -"Xunzi Persuades to Learn"

It means that the rest of the relationship is eager to return, but they send each other loudly on the water. -Su Song Shi "The Story of Shi Zhongshan"

It means that the turning point is green, taken from blue, and green is blue. -"Xunzi Persuades to Learn"

It means assuming that the relationship between kings is intentional (if); It's okay to expect a horse. -Qing Xu Ke's "The Battle of Clearing Banknotes"

I'm afraid of it. -Liu Tang Zongyuan's Snake Catcher