One handy example is the replacement of the slide rule by the pocket calculator.
一个简便的事例是用袖珍计算器代替计算尺。
If you show PowerPoint slides, remember that the general rule of thumb is no more than one slide a minute, one idea per slide and as few words as possible.
若使用投影片，切记，一般规则如下：一张投影片不超过一分钟。每张投影片只陈述一个概念。投影片上的字能少就少。
If you show PowerPoint slides, remember that the general rule of thumb is no more than one slide a minute, one idea per slide and as few words as possible.
若使用投影片，切记，一般规则如下：一张投影片不超过一分钟。每张投影片只陈述一个概念。投影片上的字能少就少。
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