If you want your kids to have strong self-esteem and the confidence that they can solve hard problems, those qualities won't magically materialize in high school.

如果你想让你的孩子拥有强烈的自尊心和解决困难问题的自信，这些品质不会在高中神奇地实现。

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Hard problems call for great efforts.

困难的问题召唤艰苦的努力。

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When people face hard problems, they make mistakes.

当人们面对难题，他们会犯错误。

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This means that you can rise above your problems if you have a goal and work very hard.

VOA: special.2009.03.01

I actually do get worked up over these things because it drives me nuts because these are not hard problems to solve and yet consistently throughout society and your own laptops there are dozens of examples I'm sure of poorly designed software.

我确实对这些东西很生气,因为它令我发狂,因为这不是很难解决的难题,然而贯穿整个社会,在你自己的笔记本上，我确信有很多这样,设计地很挫的软件的例子。

哈佛公开课 - 计算机科学课程节选

That's an important observation, and as we get to the part of the course we talk about computational complexity, you'll see that what we really care about is not how efficient the program is on easy problems but how efficient it is on hard problems.

我们已经学习了这门课程的一部分了，我们要开始认识到,计算的复杂度这个概念，你会学习到我们在乎的并不是,算法在简单问题上的工作效率,而是解决复杂问题的效率。

麻省理工公开课 - 计算机科学及编程导论课程节选

Volunteer for the hard problems (without losing track of your current job, of course).

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Ms. MADELEINE ALBRIGHT (Former U.S. Secretary of State): Talking to governments about hard problems is why diplomacy matters.

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Part of their vision is to focus on really hard problems and find technologies that when integrated could solve them.

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