The american president was due to head to france and germany for a summit marking nato 's 60th anniversary .
随后奥巴马到法国和德国参加纪念nato(北大西洋公约组织)成立六十周年的峰会。
Ill 's reactor -- celebrating its 40th anniversary this year -- is the most intense neutron source in the world .
劳厄-郎之万研究所的核反应堆今年庆祝了它四十周年的生日是世界上最密集的中子源。
The parade to celebrate the 60th anniversary of the people 's republic of china repeated the flawless execution of the olympics opening ceremony last year .