Two decades ago, Iranian students who stormed the U. S. embassy in Tehran found a mountain of paper shredded by American diplomats who were trying to hastily destroy secret documents.

• 20年前，冲进美国驻德黑兰大使馆的伊朗学生发现了堆积如山的碎纸。 那是美国外交官匆匆销毁的机密文件。