A person can learn to type and master languages or become a very good skater through practice, trial and error, study - everything of one's own effort.

一个人可以通过实践、尝试、错误和学习——一切自己的努力，来掌握打字和语言，或成为一个很好的溜冰者。

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By the way, here's where the average error is in this particular study.

顺便一提,这是这个实验的平均误差值

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Of course, the financial crisis explains this massive forecasting error, but the study finds that relatively little was due to fiscal stimulus programmes in response to the downturn.

BBC: Debt and the crisis: How did governments get it so wrong?

Of greater alarm was the fact that 5% of the consumers in the study had an error that, when corrected, placed them in a different credit risk tier and could result in paying a lower interest rate on their loans on automobiles, homes or credit cards.

FORBES: FTC Says 26% Of Credit Reports Have Errors

After all, at least he did not repeat his mistake after an 11-year-long opportunity to study and learn the fatal error of his ways.

CENTERFORSECURITYPOLICY: Center For Security Policy