If you describe someone as gracious, you mean that they are very well-mannered and pleasant.
She is a lovely and gracious woman.
她是个可爱而和蔼的女人。
If you describe the behaviour of someone in a position of authority or high social standing as gracious, you mean that they behave in a polite and considerate way.
She closed with a gracious speech of thanks.
她以彬彬有礼的致谢辞作结。
You use gracious to describe the comfortable way of life of wealthy people.
He drove through the gracious suburbs with the swimming pools and tennis courts.
他开车穿过了建有游泳池和网球场的舒适的城郊。
Some people say 'good gracious' or 'goodness gracious' in order to express surprise or annoyance.
Good gracious, look at that specimen, will you?
天哪,你快来看看这个家伙吧!