今天专业英语课做presentation的演示文稿，嘿嘿。

Good morning, everyone.It’s a great honor for our team, the Martian, to be the 1^st one to give you the speech. And we will give you a brief introduction to the subprime mortgage crisis.During our presentation we will mention a lot of specialized words and expressions, so firstly I will explain the vocabulary for you.

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