Since the dawn of agriculture more than 10 000 years ago mankind has had to deal with a resourceful and fearless enemy, Schistocerca gregaria, the desert locust.

自从一万多年前农业诞生以来，人类就一直在与源源不断和无所畏惧的敌人schistocerca gregaria，即沙漠蝗虫打交道。

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This is West Africa's biggest locust disaster in 15 years.

这次蝗灾是西部非洲15年以来最大的灾害。

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This is West Africa's biggest locust disaster in 15 years.

这是西非15年以来最严重的一次蝗虫灾害。

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But few of them are as short-term as the locust-critics suggest: typically, they invest in a firm for around five or six years.

ECONOMIST: American investors fight each other over Celanese