Now, if I want to call Al back right now, I can just push that call back button. Isn't this awesome?

如果我想给艾尔回电话，我可以点击那个回电按钮。是不是很棒？

So now we can, for example undo things by saying " No" rather than having to go a manipulate the whole screen to get to a back space button, for example.

现在我们可以，比如说通过说“不”来取消指令，不再需要回到屏幕上点击取消按钮了。

At the top of your internet page, on the left side in windows, you'll have a back button, and if you go back, then you'll suddenly have a forward button.

在你的互联网页面的顶部， 在窗口的左侧， 你会有一个后退按钮，如果你返回， 然后你会突然有一个前进按钮。

A browser can help by remembering where you've been over the short term using the back button, or over time with the history menu. And you can add a bookmark for any page to get back to it quickly.

浏览器可以在短期内记录你的浏览历史，点击返回键或历史菜单找到原来的页面。你还可以把网页添加到书签中，以便随时打开。