Royal Highness
(used as the title of a royal person, esp a prince or princess 用作王室成员(尤指王子、 王孙或公主、 孙公主)的尊称)
Her Royal Highness, the Princess of Wales 储妃殿下
Their Royal Highnesses, the Duke and Duchess of York 约克公爵及公爵夫人殿下
Thank you, Your Royal Highness. 感谢殿下.