殿下
His (Her,Your)Highness對(duì)一般親王稱呼時(shí)用；His (Her,Your) Royal Highness對(duì)王儲(chǔ)稱呼時(shí)用；His (Her,Your)Imperial Highness對(duì)帝國(guó)皇儲(chǔ)稱呼時(shí)用/親王～ His Highness Prince…/王儲(chǔ)～His Royal Highness the Crown Prince/太子～ His Imperial Highness(for imperial crown prince)