“代总统”常见的英文表达是 “acting president” 。
例如:The vice president became the acting president when the president was seriously ill.(总统病重时,副总统成为了代总统。 )
此外,在特定语境下,也可使用 “interim president” 来表示在正式总统选出或就任前的过渡性、临时性总统角色。不过“acting president”使用更为普遍和直接对应“代总统”这一概念。