伊朗核项目协议将于1月20日开始生效

A deal to limit Iran\'s nuclear program in exchange for limited sanctions relief is set take effect January 20.

Officials from both sides confirmed the start date Sunday, after experts spent weeks discussing how to implement the six-month pact they first agreed to in November.

Iran will limit its uranium enrichment to five percent and reduce its stock of higher-enriched uranium, while also allowing United Nations inspectors to access nuclear facilities.

In exchange, the United States and European Union will ease sanctions that have squeezed Iran\'s economy.

Iran and the six world powers, which include the U.S., Britain, China, France, Russia and Germany, will use the six months to continue negotiations on a long-lasting deal to address fears that Iran is seeking to build nuclear weapons.

U.S. Secretary of State John Kerry said reaching a comprehensive agreement will be tough, but that the negotiations are the best way to resolve the issue "peacefully and durably."

协议双方的官员星期日确认了协议生效日期。在此前数星期里，专家们讨论了如何实施这项去年11月达成的有效期为半年的协议。

伊朗将把铀浓缩纯度限制在5%，并削减高纯度浓缩铀的储备量，同时允许联合国检查员进入其核设施。

作为交换，美国和欧盟将放松对伊朗的制裁。伊朗经济受到制裁措施的遏制。

伊朗和世界六强国将利用这半年时间继续就一项长期协议进行谈判，以打消对伊朗寻求研制核武器的忧虑。六强国包括美国、英国、中国、法国、俄罗斯和德国。

美国国务卿克里说，达成一项全面协议将是艰巨的，但谈判是“和平及持久”解决这一问题的最佳途径。