慢速英语:Broccoli and Cauliflower - Their Tops Make Good Eating

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are high in富含……

相当于：

be rich in富于,盛产,有很多…

例句：Those countries are rich in mineral resources.
      那些国家矿物资源很丰富。

abound in充满,有大量的…,盛产…

例句：The English language abounds in phrasal verbs.
     英语里有大量的短语动词。

2.Harvest the center flower-bud cluster of broccoli when it reaches the size you want and while the buds are still tightly together.

这句话的前半部分是主句，Harvest the center flower-bud cluster of broccoli，后面的when and while都是状语。

3.The less time they cook, the better.

the +比较级……, the+比较级”，表示“越……越……”。

　　The more money you make, the more you spend.
　　钱你赚得越多，花得越多。

　　The sooner，the better.
         越快越好。