该内容是考试会涉及到的知识点，北京张博士医考中心搜集整理，请参考。

　　例句：

　　Grade inflation—the gradual increase in average GPAs(grade-point averages)over the past few decades—is often considered a product of a consumer era in higher education,in which students are treated like customers to be pleased.

　　解析：

　　本句话主干：“Grade inflation is often considered a product of a consumer era in higher education”，“the gradual increase in average GPAs(grade-point averages)over the past few decades”为同位语，解释“Grade inflation”的含义。“in which”为从属连词，引导定语从句，修饰“consumer era in higher education”。

　　翻译：

　　成绩膨胀(过去几十年平均绩点的逐渐提高)通常被看作是高等教育所处消费者时代的产物。在这个时代下，学生都被学校当作是需要被取悦的消费者。

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