I never imagined this would be something I'd miss, but it's just another small detail that works really well on the iPhone and you'll notice when its gone.

我从未想到这是我没有体验的东西，但是这在iPhone上仅仅是一个工作非常好的小细节，当运行的时候你会注意到。

youdao

This works well, but it's a high-level of abstraction and many developers completely forget-or never learned-how the HTML layout actually works behind the scenes.

这一点很不错，但是首先这种高度的抽象使很多开发人员完全忽略了——甚至从没有了解过在这背后HTML是如何运作的。

youdao

So, let's see this eraser actually never works very well so I'm just going to draw below it.

这个清除器不能很好地运行,我将在下面画出它。

哈佛公开课 - 计算机科学课程节选