虽然我们需要等待更长的时间才能收到信，但在今天这个繁忙的世界里，我们需要一些值得等待的东西。

Although we have to wait longer for our letters, in today's busy world we need something that is worth waiting for.

youdao

最终，这一切都是在学习，但在今天，许多孩子拒绝接纳科学教育。

In the end, it's all learning, but many children today exclude themselves from a scientific education.

youdao

但在今天，你就不能这么肯定了。

Today, you can't be so sure.

youdao

There's a whole bunch of blocks that we'll look at in more fun detail on Friday but I'm going to pick the easiest one here and I'm going to type Hello CS50 in this string, "Hello CS50", zooming in say how nice the puzzle pieces are nicely interlocked?

今天我们看到的各种图块,到下周五我会仔细讲解其中的精妙之处,但今天我只想举一个最简单的例子,我要在这儿键入字符串，放大窗口，然后看看这漂亮的图形和文字,是如何美妙地连结在一起的？

哈佛公开课 - 计算机科学课程节选

Hard to believe today, but Sicily was one of the major granaries of the Mediterranean world at that time, tremendously fruitful, able to grow the best possible crops, very good wheat and so on.

在今天很难想象,但西西里是当时地中海地区,最主要的粮仓之一,产物丰盛,能够种植最好的谷物,上乘的小麦等等

耶鲁公开课 - 古希腊历史简介课程节选