Dust blows off the Sahara today, reaching all the way to the Americas.

灰尘从现在的撒哈拉沙漠被吹过来，一路旅程到达美洲。

In some regions, like the Sahara, the amount of rainfall can change drastically within a single generation.

在一些地区，比如撒哈拉沙漠，降雨量可能在一代人的时间内急剧变化。

IN 1918, I turned my back on the world I had known and went to north-west Africa and lived with the Arabs in the Sahara, the Garden of Allah. I lived there seven years. I learned to speak the language of the nomads.

1918 年，我背弃了我所熟悉的世界，前往非洲西北部，在阿拉的花园撒哈拉沙漠中与阿拉伯人一起生活。我在那里住了七年。我学会了说游牧民族的语言。