Black can besmirch white and a bad odor wipe out a fragrance easily,but not vice versa.This is what happens when a gentleman is confronted by a cad or a sneak.

• 黑与白交，黑能污白，白不能掩黑；香与臭混，臭能胜香，香不能敌臭，此君子小人相攻之大势也。