现在，一些趋势已日渐明朗：南、北美洲和北欧正变得潮湿，地中海地区和非洲南部则日趋干旱。

Some trends now seem clear. North and South America and northern Europe are getting wetter; the Mediterranean and southern Africa drier.

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事实上，有淀粉的番薯，都有浅黄色且粗糙的果肉，褐色的表皮；他们原产于非洲和亚洲，也是加勒比海地区和非洲部分地区的主要产品。

In fact, actual yams have starchier, light yellow flesh and a rough, brown skin; they are native to Africa and Asia, and an important staple in the Caribbean and in parts of Africa.

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