Diplomacy is no small matter, especially involving national dignity, which is absolutely inviolable. Yan Zi defended his national dignity and personal dignity by "pointing the needle at wheat". Yan Ying is smart, witty, eloquent and fearless. Yan Zi: Euphemism, wit and eloquence, clever struggle without losing etiquette, defending the dignity and patriotism of the motherland. The reasons for winning this diplomatic victory are: supercilious, polite, resourceful and clear-headed.