重点讲解：
1. be rich in
富含…的；含有大量…的；
eg. Oranges are rich in vitamin C.
柑橘里含有丰富的维生素C。
eg. he assay result of that material is rich in iron.
化验结果表明那种物质含铁量丰富。
2. a range of
（同类事物的）一系列，一连串；
eg. The two men discussed a range of issues.
那两个人讨论了一系列问题。
eg. A wide range of colours and patterns are available.
各种颜色和样式都有。
3. take advantage of
利用；
eg. I intend to take full advantage of this trip to buy the things we need.
我打算充分利用这次旅行来购买我们所需的物品。
eg. In spring we usually set the clocks ahead one hour to take advantage of the summer daylight.
春季我们通常把钟拨快一小时以充分利用夏天的白昼。