重点讲解：
1. refer to
指的是；
eg. It can refer to an academic subject or a practical skill.
这一词既可指某一学科也可指某种技能。
eg. The term "Internet" is often used to refer to the entity of various services available via the Internet .
所谓“上网”是常常用来指通过互联网所实现的各种服务实体。
2. due to
由于；因为；
eg. All loss due to improper packing shall be born by the seller.
由于包装不当而引起的一切损失均应由卖方负责。
eg. Due to bad cold she spent the entire day in bed.
她因重感冒在床上躺了一整天。
3. be based on
以…为基础；
eg. The monetary system of some countries used to be based on gold.
过去有些国家的货币制度是金本位制的。
eg. Jefferson's courage and idealism were based on knowledge.
杰斐逊的勇气和理想主义是建立在知识的基础上的。
4. aim to do sth.
致力于；旨在；以…为目标；
eg. He aim to streamline the office.
他的目标是提高办公室的工作效率。
eg. My brother aims to be a novelist.
我兄弟立志当小说家。
5. report on
（就某个事件或主题）报告情况，报道；
eg. I'll now call at the vicarage and report to you in due course.
我现在要去教区牧师家拜访，然后适时向你汇报情况。
eg. Many journalists enter the country to report on political affairs.
许多记者进入该国对政治事件进行报道。
