But it's not going to be without tragedies such as we've seen,".

VOA: standard.2009.10.26

And here, I'm going to suggest we've seen numbers, we've seen strings, and I'm going to add Booleans here as well.

我要提醒下大家我们学习过数字数据了,学习过字符串了，今天还要学习布尔类型，这是当我们谈到条件的时候。

麻省理工公开课 - 计算机科学及编程导论课程节选

So when you define a function, you have, as we've seen these curly braces, that define all ; of the code that's associated with that function; open curly brace code, close curly brace, that is the function.

当你定义一个函数，就像我们看到的这些花括号，定义了与,那个函数相关的所有代码;,左花括号，代码，右花括号，这就是一个函数。

哈佛公开课 - 计算机科学课程节选

The loss of -- the job loss this past year and the months preceding it were as severe as anything we've seen for a very long time, as rapid as we've seen in a very long time.

WHITEHOUSE: President Obama Closes Forum on Jobs and Economic Growth

As rich as one can be we have to always remember that if we rush into things as if we've never seen them or as if we are going to finish them, we are endangering ourselves.

BBC: NEWS | Africa | Is cosmetic surgery worth the risk?

But as we've seen over the years, the TV isn't simply for watching TV anymore: We have DVD players for watching movies.

FORBES: Shoot Your Own HDTV Movie