US President Barack Obama has arrived in the UK, the second stage of his four-nation trip through Europe.
美国总统奥巴马已经抵达英国，这是他欧洲四国游的第二站。
He arrived in London a night earlier than schedule due to the Icelandic volcanic ash cloud. The Obamas will enjoy a state dinner and stay at Buckingham Palace, with Queen Elizabeth the Second as host.
由于冰岛火山灰的影响，他比预定时间提前一晚到达伦敦。奥巴马夫妇将应英国女王伊丽莎白二世邀请，接受女王的国宴款待，并下榻白金汉宫。
But Obama also will confront difficult problems as he and Prime Minister David Cameron are expected to review the NATO action to help end conflict in Libya. They will also discuss Western policy towards unrests in the Arab world. Earlier, Obama announced the formation of a new joint US-British national security council.
但是奥巴马也面临着难题，他和首相大卫卡梅伦预计要审查北约的行动，帮助结束利比亚冲突。
It's designed to allow the two countries to work more closely together and share intelligence on long-term security challenges, particularly in the Middle East and Afghanistan. Obama will then travel to France, to meet the heads of leading industrial nations, before ending his European trip with a visit to Poland.
这样做目的是使两个国家更加亲密合作，对长期安全问题分享情报工作，尤其是关于中东和阿富汗的问题。奥巴马下一站将飞往法国，会见这个主要工业国的领导人，然后到欧洲之旅的最后一站——波兰进行访问。