All you can do to prevent potato blight is keep an eye on your crops.

为预防马铃薯枯萎病你惟一能做的就是留意你的庄稼。

《柯林斯英汉双解大词典》

Now 70-80% do. The aphid that causes potato blight now appears a month earlier than it used to, so it feeds on the plant at a more vulnerable point in its life.

现在70 - 80%的蚜虫都有了这种耐药性，蚜虫导致的马铃薯晚疫病，现在出现比以往提前一个月来，所以蚜虫在植株的脆弱期就开始啃噬植株。

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Now, dig back to recent history\\\'s potato famine in Ireland, where a blight knocked out the whole crop, which consisted of just a few varieties, and millions of people died of starvation.

现在，回溯到近代历史上在爱尔兰发生的马铃薯饥荒，由仅仅几个品种引起的植物枯萎病危及了所有农作物，并导致数以百万计的人死于饥饿。

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