雅思写作常用词汇：即/也就是

　　namely即/也就是

　　eg: Only one person can do the job, namely you.

　　from...onwards从...开始

　　span持续时间

　　eg: over a span of ... years;

　　typical/distinctive/representative典型/有代表性的

　　in terms of在 ... 方面

　　eg: Think of it in terms of an investment.