这是首次在尼日利亚历史上出现的情况，一位现任总统在大选中失败。

Welcome to CNN STUDENT NEWS.

欢迎收看今天的CNN学生新闻。

One major challenge facing the African nation is the Boko Haram terrorist group. Nigerian voters apparently felt that the nation`s former military ruler, Muhammadu Buhari, would be more effective at fighting them. Buhari is set to replace outgoing president Goodluck Jonathan.

非洲国家安全最主要的挑战就是博科圣地恐怖组织。尼日利亚投票者认为前军事统治者布哈里更有能力领导军队打击恐怖组织。布哈里将要替代乔纳森出任尼日利亚总统。

To Switzerland. A deadline came and went between Iran and six other countries, including the US.

再来看瑞士。包括美国在内的关于伊朗核问题的七国谈判进入最后期限。

The goal?

谈判目标是什么呢?

Reaching an agreement concerning Iran`s controversial nuclear program.

就是就伊朗备受争议的核计划问题达成协议。

The deadline was extended to today. Talks on this issue have happened several times before in several cities. One sticking point, the international sanctions on Iran`s economy. Iran wants those lifted. Other countries don`t want to lose their leverage in getting Iran to freeze its nuclear program.

今天是谈判的最后期限。之前就此问题在多个城市也进行了多次讨论。其中一个关键问题就是国际社会对伊朗经济的制裁。伊朗希望国际社会解除对其国家的经济制裁。其他国家不希望失去这次可以令伊朗方面放弃核计划的机会。

CARL AZUZ, HOST: For the first time in Nigeria`s history, an incumbent president has been defeated in an election.

Welcome to CNN STUDENT NEWS.

One major challenge facing the African nation is the Boko Haram terrorist group. Nigerian voters apparently felt that the nation`s former military ruler, Muhammadu Buhari, would be more effective at fighting them. Buhari is set to replace outgoing president Goodluck Jonathan.

To Switzerland. A deadline came and went between Iran and six other countries, including the US.

The goal?

Reaching an agreement concerning Iran`s controversial nuclear program.

The deadline was extended to today. Talks on this issue have happened several times before in several cities. One sticking point, the international sanctions on Iran`s economy. Iran wants those lifted. Other countries don`t want to lose their leverage in getting Iran to freeze its nuclear program.