In this study, instead of teaching students that their smartness can change, we taught them that their social standing—that is, whether they are bullied or excluded or left out—can change over time.

在这项研究中，我们没有告诉学生，他们的聪明才智是可以改变的，而是告诉他们，他们的社会地位是可以改变的，也就是，无论他们是否受到欺凌或被排挤，那都会随着时间的推移而改变。

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We also know that a long time without change or challenge can lead to boredom, and physical and mental strain.

我们也知道，长时间没有变化或缺乏挑战会导致无聊，造成身体和心理上的疲惫。

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I just believe it's time to change.... I know we can do better.

我只是觉得已经到了改变的时候……我知道我们能做得更好。

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We can change the world one person at a time and one drink of water at a time.

WHITEHOUSE: Dream Big: Water

Our differences are in how we can best achieve these things in a time of unprecedented change.

CNN: Clinton: Time again to choose a more perfect union

It was the first time we can gauge whether Londoners were willing to change their well-worn travel habits to make way for Olympic spectators, says BBC London's transport correspondent Tom Edwards.

BBC: London's travel network clears its first Olympic hurdle