translation.en: And finally, it often happens that you're giving a talk, and for some reason, the audience is looking at the slide instead of at you!  So when that happens -- this works in Keynote, PowerPoint, it works in every program -- all you do is hit the letter B key, B for blackout, to black out the slide, make everybody look at you, and then when you're ready to go on, you hit B again,
translation.zh: 最后，你在发表演说，但常常 出于一些原因，观众在看幻灯片。 而不是你！ 所以，当出现这样的情况时，比如在Keynote, PowerPoint， 这个方法都有效的，你所要做的就是按下字母B键， 黑掉幻灯片。黑掉它。 这让每个人都关注你。然后当你准备继续，