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Many Americans learned this the hard way by investing all their money in stock shares, which then lost value.

VOA: special.2011.03.27

But let's take something simple like the Pythagorean Theorem, which we all learned in high school.

不过我们还是说些简单的,比如勾股定理,我们中学里都学过的

耶鲁公开课 - 死亡课程节选

It's a... I'd hate to learn all by, when I was a little kid, when I learned, but...

我小的时候很讨厌学，我学的时候…

享受冲浪 - SpeakingMax英语口语达人

First, I think we have all learned that America needs to provide health insurance for all Americans.

CNN: Clinton's September 17, 2007, speech on health care

Lugar of Indiana and Arlen Specter of Pennsylvania have all learned their lesson -- at least for now.

CNN: Could Gingrich Top GOP's 2000 List? - 01-10-98

Service businesses start with something we all learned in kindergarten: the Golden Rule.

FORBES: Why Americans Should Go Postal Over The Postal Service Default