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

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hoppers takes adults normally become weeks it four for to
  1. The young locusts are known as hoppers,
    沙漠蝗的若虫是跳跃能手
  2. for at this stage they're flightless.
    在这一阶段 它们还不能飞
  3. They find new feeding grounds by following the smell of sprouting grass.
    它们循着萌发的草香寻找新的用餐场所
  4. 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
  5. but when the conditions are right as now
    但如果条件允许 譬如现在
  6. their development switches to the fast track.
    它们的生长过程就会切换到快车道
  7. As the vegetation in one place begins to run out
    当一个地方的植物即将吃光时

来自《行星地球 第一季 第五集 Planet Earth S01E05 沙漠》第 307 行

Walden21
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