VOA慢速英语:Integrated Pest Management Can Increase Crop Production

meant for有...有意图,意欲

例句：What does this mean for the consumer?
      这对消费者意味着什么？

2.He says one basic IPM method is to plant as early in the season as possible so that most of the crop will be in by the time a disease or pest arrives.

so that引导结果状语从句。

3.Not all insects are pests.

not部分否定

all，every，both，always等用于否定结构时不是全部被否定，而是表示其中的一部分被否定。而且英语多半将not置于谓语中。

例如：

All is not a gold that glitters.（即Not all that glitters is gold.）
闪闪发光物，未必尽黄金。

Every one cannot write novels.（即Not every one can write novels.）
不是所有的人都能写小说。

I don’t like both of the novels.（即I like only one of the two novels.）
这两本小说我不是都喜欢。

4.They have had their genes changed to contain a special characteristic, like resistance to certain insects.

have/has sth done(过去分词）有两个意思

（有意地）让他人为自己做某事，即过去分词所表示的动作由别人完成，而宾语是过去分词所表示动作的承受者或动作对象。

例句：I’ll have a new suit made of this cloth．
            我要用这种布料做一套新衣服。

（无意识地）让某人（或某物）遭受不幸

例句：He had his handbag stolen．
          他的手提包被人偷了。