In the Sahara desert, one train car of dust is swept airborne every four seconds.

在撒哈拉沙漠中，每四秒钟就有一节火车车厢的灰尘被扫过。

The first wave, weeks ago, was the worst in 70 years. Now a second wave 20 times bigger is sweeping across Kenya and other countries.

几周前出现第一波蝗灾，这也是70年来最严重的，如今第二波是第一波的20倍之多，横扫了肯尼亚等其他国家。