Despite these challenges, two vaccine candidates have advanced to evaluation in human subjects in countries with endemic disease, and several potential vaccines are in earlier stages of development.

尽管面临挑战，两种登革候选疫苗已在登革热流行国家进行后期临床评价，一些其他候选疫苗尚处在较为初级的开发阶段。

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What's more, it still has a huge potential for growth; and personally I'm ready to take new challenges. Actually, this is a perfect stage for my career development.

同时，更重要的是她还有着巨大的发展潜力，而我本人又非常乐于接受新的挑战，实际上，这对我来说是一个很好的职业舞台。

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"Mali is at the heart of a range of complex political, security and development challenges that have the potential to affect the wider region and it is vital that we work together to tackle these challenges, " he said.

BBC: William Hague in Mali for talks on security talks