Flu viruses do sometimes get nastier .

流感病毒的确有时候会变得更严重。

Most obviously , how these countries fare will determine whether the world economy faces a mild recession or something nastier .

尤为显而易见的是，这些新兴国家所采取的对策将决定世界经济是面临轻微的衰退还是一场严重的经济危机。

In the coming months the country may have a chance to break with the worst excesses of corruption , or else slide into even nastier civil conflict .

在接下来的数月中，肯尼亚可能有机会摆脱最腐败的国家政府，或者陷入更糟糕的内战之中。

But things can get a lot nastier without reaching a total great depression scenario where the economy shrinks by 25 percent and unemployment soars by 25 percent .

然而，就算没有出现巨大的经济大萧条（经济萎缩25%和失业率飞涨25%），经济也会变得很糟糕。

Above all , there is a worry that the slightest provocation could turn things much nastier .

最重要的是，人们担忧即便是最轻微的挑衅也能让局势急剧恶化。