- they form a swarm.
形成了一团蝗虫云 - An adult locust eats its entire body weight every day,
成虫每天的进食量相当于自己的体重 - and a whole swarm can consume literally hundreds of tonnes of vegetation.
而整团蝗虫云能消耗掉数百吨植物 - They have to keep on moving.
它们必须不停地迁徙 - The swarm travels with the wind -
沙漠蝗御风而行 - it's the most energy-saving way of flying.
这是最省力的飞行方式 - Following the flow of wind means that they're always heading toward areas of low pressure,
随着风向迁徙意味着 它们总是飞向低压地区
They have to keep on moving. 它们必须不停地迁徙
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