请帮我翻译一下：Juan Louis, a junior geology major, decided to give

请帮我翻译一下：
Juan Louis, a junior geology major, decided to give an informative speech about how earthquakes occur. From his audience and analysis he learned that only 2 or 3 of his classmates knew much of anything about geology. Juan realized then that he must present his speech at an elementary level and with a minimum of scientific language. As he prepared the speech, Juan kept asking himself, “How can I make this clear and meaningful to someone who knows nothing about earthquakes or geological principles?” Since he was speaking in the Midwest, he decided to begin by noting that the most severe earthquake in American history took place not in California or Alaska but at New Madrid, Missouri in 1811. If such an earthquake happened today, it would be felt from the Rocky Mountains to the Atlantic Ocean and would flatten most of the cities in the Mississippi valley. That, he figured, should get his classmates’ attention. Throughout the body of the speech, Juan dealt only with the basic mechanics of the earthquakes, carefully avoid technical terms. He also prepared visual aids, diagramming photo line, so his classmates wouldn’t get confused. To be absolutely safe, Juan asked his roommate, who was not a geology major, to listen to the speech. “Stop me,” he said, “any time I say something you don’t understand.” Juan’s roommate stopped him four times. And at each spot, Juan worked out a way to make his point more clearly. Finally, he had a speech that was interesting and perfectly understandable to his audience.
注：机器翻译不要,谢谢了.

Juan Louis,一位初级地质学者,决定就关于地震如何发生进行一篇教育演讲.从他的演讲和分析中得知只有2到3个人对地质学了解甚多.Juan了解到他必须将他的演讲用最基本的并且用最少的术语来表达出来.当他在准备演讲时,他一直问自己‘如果对方根本不知道地震或地质方面的东西,我该怎样让他清晰地理解我说的话?’.他决定在美国中西部进行演讲时,他并没有挑出美国历史中加州或阿拉斯加州发生的地震,而选择了1811年密苏里,新马德里发生的那次.如果这种地震在今天发生在当今,我们会发现从密西西比河附近的城镇从落基山脉到大西洋这段全部会夷为平地.那样,他会觉得能引起学生们的注意.通过肢体语言,JUAN避免术语,只有基本常识来解释.他还准备了图表,图像来让学生便于理解.为了保持万无一失,JUAN问了他的室友,同样也是一位地质学者,来听他恶演讲.‘让我停下来.’他说,‘只要我说了你不懂的话.’JUAN的室友让他停下了4次.每一次,JUAn都试着让他的观点更为清晰.最后,他终于让他的听众们能有兴趣并完全理解他的演讲.