慢速英语:Diseases of Cassava Wreak Havoc in Africa

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短语讲解：

1. More than 160 million people across Africa depend on the plant for food or to earn money.

depend on 依赖
例句：You can depend on this newspaper.
你可以依赖这家报纸。

2. The amount of cassava being grown in east and central Africa is falling because of diseases that reduce production.

because of 因为
例句：We broke up because of an invitation.
我们因为一次邀请而分手。

3. Doing right or wrong on cassava has a huge impact on the food security of the people in this region, has such a relevance in our daily lives that we tend to forget it because it appeared in a kind of technical discussion.

impact on 对…冲击，碰撞
例句：The impact on the government is another matter.
政府遭受的影响则是另一回事了。

4. The FAO says at least $100 million is needed.

at least 至少
例句：Read at least 30 books.
至少读30本书。