Then they try to teach the students something with a specific presentation style, like using visual AIDS, and do a follow up test to see how much they learned.

然后他们试着用一种特定的演讲风格教学生一些东西，比如使用视觉辅助，和做一个后续测试，看看他们学到了多少。

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In presentations using visual aids, she says, use no more than one slide a minute.

ECONOMIST: Damned lies and statistics

There's a chart behind me right here -- we're using visual aids today. (Laughter.) The bar on the left shows that six years ago, 60 percent of the oil we used was imported.

WHITEHOUSE: President Obama Speaks on American Energy