a person or event that is so good or successful at something that it will be difficult for anyone/anything else coming after them to be as good or successful令人望尘莫及的人；难以企及的事件
She has been an excellent principal and will be a hard act to follow.她是一位出色的校长，也是一位难以效仿的校长。
Their contribution will prove a tough act to follow.他们的贡献将被证明是一项艰巨的任务。