- Normally it takes four weeks for hoppers to become adults,
一般说来 若虫需要 经过4周才能变成成虫 - but when the conditions are right as now
但如果条件允许 譬如现在 - their development switches to the fast track.
它们的生长过程就会切换到快车道 - As the vegetation in one place begins to run out
当一个地方的植物即将吃光时 - the winged adults release pheromones - scent messages,
长着翅膀的成虫便释放出信息素 即一些气味信号 - which tell others in the group that they must move on.
提醒蝗群中的其它成员它们应该动身了 - And when groups merge,
蝗群合并之后
As the vegetation in one place begins to run out 当一个地方的植物即将吃光时
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