The introduction should clearly tell the audience what the presentation will cover so that the audience is prepared for what is to come.
引言应该清楚地告诉听众这次演讲所涵盖的内容这样听众就会对下面的内容有所准备。
The S.&P. analysis, called “Global Aging 2010,” warns that many countries are not prepared to cover the pension and health care costs of so many additional retirees;
标准普尔的这份称为“全球老龄化在2010年”的报告，警告道，许多国家都没有做好准备为迅速增加的退休人员支付退休金和医疗费；
Around the teaching of literacy materials prepared must cover the entire contents of basic courses.
各地扫盲教学材料的编写须覆盖基本课程的全部内容。
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