add accent bar的用法和样例：
- Using one spot color when you print your publication at a commercial printing service reduces printing costs while giving the publication the richness of an added accent color.
- Total effect can be achieved by using blue and white everywhere, i.e. on the walls, furnishings, draperies etc and by adding accent pieces of different colors like red, yellow.
- She has a foreign accent that I can't quite place.
- His accent betrayed the fact that he was foreign.
- Judge by his accent, he must be from the south.