VOA慢速英语:Demand for Wheat Growing in Sub-Saharan Africa

1. discuss vt. 讨论
例句：This problem can discuss tomorrow.
这个问题可以明天讨论。

2. grow vt. 种植；扩大
例句：Plants can not grow without air.
植物没有空气不能生长。

3. transportation n. 运输
例句：Ships were the main form of transportation in world trade for thousands of years. 
船舶是几千年来世界贸易的主要运输工具。  
 
4. store vt. 储存
例句：They tried to store information in a form which is readily understandable. 
他们试着用一种易懂的方式储存信息。 
 
5. improve vt. 提高
例句：How can I improve my spoken English? 
我该怎样才能提高英语口语水平？ 

6. estimate vt. 估计
例句：Can you estimate its length/how long it is? 
你能估计其长度[它有多长]吗?