president/presidential

president /ˈprezidənt/ n.［c］ 1. 总统，主席: the President of America 美国总统；the president of the U.N. General Assembly 联合国大会主席 2.主任；总裁；大学校长：the president of the bank 银行行长

 presidential /ˌpreziˈdenʃəl/ adj. 总统的，总统选举的；总裁的：the presidential inauguration总统就职典礼；presidential government总统制政体According to the American Constitution, presidential elections are held every four years.根据美国宪法,总统选举每四年举行一次。