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

313. And when groups merge,
     蝗群合并之后
314. they form a swarm.
     形成了一团蝗虫云
315. 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
316. 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
317. They have to keep on moving.
     它们必须不停地迁徙
318. The swarm travels with the wind -
     沙漠蝗御风而行
319. it's the most energy-saving way of flying.
     这是最省力的飞行方式

来自《行星地球 第一季 第五集 Planet Earth S01E05 沙漠》第 316 行