a power of attorney

例句：

1. 1. He signed a power of attorney for his daughter when she went to college.
   他为女儿上大学时签署了一份授权书。
2. 2. The lawyer acted as the attorney-in-fact during the trial.
   律师在审判期间担任了事实上的代理人。
3. 3. She needed an attorney-in-fact to represent her interests in court.
   她需要一个事实上的代理人来代表她在法庭上的利益。