It once changed the course of a young man's life.

它曾改变了一个年轻人的一生。

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I once changed a car to run on waste vegetable oil.

我曾改装了一辆汽车，它可以烧废弃的植物油。

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So here are their payoffs and once again the basic structure of the game hasn't changed.

这就是他们的收益,这次博弈的基本结构还是不变

耶鲁公开课 - 博弈论课程节选

But once the financial crisis hit, things changed a little bit, and so there is more competition.

但一旦金融危机爆发了，情况稍微有所改变，因此竞争就会更激烈了。

哥伦比亚的氛围 - SpeakingMax英语口语达人

He once changed the words of Rihanna's infectious hit "Umbrella" to teach geography.

CNN: Bringing song to Obama's inauguration, students savor fame

Dredd has repeatedly chosen the law over family (to his credit, he once changed the law to help his family).

FORBES: Is 2000 AD's Judge Dredd Gay?

More recently with the iPhone, Apple once again changed the rules of the in-car infotainment game.

FORBES: How Steve Jobs Changed The Auto Industry