Post that in your notebook for a host of volunteers who will help you.

Although he was always the "background" briefer on foreign policy issues, he could never be identified as anything other than "a White House official" or "a high Administration source." 虽然外交问题的“背景情况”总是由他介绍，但他也仅仅只能被认为是“一位白宫官员”或者“一位政府高级人士”。