埃文斯还说，海地地震中突如其来的因素意味着，在海地开展救灾动员工作比在其它遭遇自然灾害的贫穷国家更困难。
Evans also said the element of surprise in the Haiti earthquake meant it had been harder to mobilise relief efforts compared with natural disasters in other poor countries.
经研究，自然灾害在15个风险因素中排最后一位，并且其风险仍在降低。
Natural disaster is at the very bottom of the 15 risks we studied, and it's in decline.
对中期而言，自然灾害对产出减少的影响，主要取决于以下几个因素。
How much a natural disaster reduces output over the medium term depends on a number of factors.
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