你可以用“在课堂上使用幻灯片越来越受到欢迎”这句话作为你文章的开头。

You can start your essay with the sentence "The use of PowerPoint is becoming increasingly popular in class."

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用幻灯片介绍世界的陆地。

Using PowerPoint, introduced the continents of the world.

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用幻灯片显示一些城市地图。让同学们用英语说出方位。

By PowerPoint, show some city maps. Have the students locate places and saying locations in English.

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C So here I'm declaring a variable called c, and I'm pretty much translating the formula from the slide using the characters on my keyboard to a floating point value.

这里我声明了一个变量，然后我把那个幻灯片上的公式,用键盘上的字符翻译成了,浮点数值。

哈佛公开课 - 计算机科学课程节选

Okay. Now Eva has another gig out in Gilford this morning so she's going to run off, and I'm going to show you, maybe, if we can get our slides up, this overtone series stuff.

伊娃今早在吉尔福特还有其他表演,所以她得告辞了,现在,要是我的幻灯片能用的话,我要用幻灯片为你们演示,这些有泛音列的乐器

耶鲁公开课 - 聆听音乐课程节选

We've seen this branching construct in Scratch, we've seen it a moment ago on the slide, and see, we just need else if to use not an else, not just an if but an else if.

我们看到了这个Scratch的分支结构，我们看到刚才在幻灯片中，了解到，我们不需要,用一个else，也不只是用一个if，而是用一个。

哈佛公开课 - 计算机科学课程节选