Obama's introduction to National Security Strategy report 奥巴马为《国家安全战略》撰写的序言 U.S. President Barack Obama released his first National Security Strategy report on ...

美国本星期发布了长达48页的国家安全战略（National Security Strategy）文件。该文件列出了总统乔·拜登（Joe Biden）所认为的美国面临的最严重挑战 ...