他把时间花在设计难以破解的数学难题上。
He spent his time devising incomprehensible mathematics puzzles.
因此，汽车制造商面临着怎样向新顾客树立产品形象的难题。
So car makers are faced with the ticklish problem of how to project products at new buyers.
这给气候科学家们带来了一个难题。
迈尔斯·亨顿正在解决这个难题。
这带来了两个难题。
那些能够解决难题的人是对雇主最有价值的人。
Those who are able to solve difficult problems are the ones who are the most valuable to the employer.
这项工作中的唯一难题是有时在夜里开车很危险。
The only serious difficulty in this work is that it's sometimes dangerous to drive at night.
一个必要的条件似乎是某种对人类难题超然客观的看法。
One necessary condition seems to be a somewhat detached view of human problems.
像俄国著名作家托尔斯泰一样，许多人也提出这些难题。
Like Leo Tolstoy, the famous Russian writer, many people ask these difficult questions.
这就造成了一个难题：数百万年前消失的特征是如何突然重现的？
And this poses a puzzle: how can characteristics that disappeared millions of years ago suddenly reappear?
即使没有区域差异的问题，岩石作为独特的时间标记也是一个难题。
Even without the problem of regional differences, rocks present a difficulty as unique time markers.
埃里克带我们回到了自从我们开始读洛克之后就一直在努力解决的难题。
Eric brings us back to the puzzle we've been wrestling with since we started reading Locke.
蝙蝠们遇到了一个技术上的难题：如何在没有光线的条件下认路和捕食。
Bats have an engineering problem: how to find their way and find their prey in the absence of light.
相反，我喜欢解决难题，因为我通常会把这些难题看作令人激动的挑战。
On the contrary, I like solving difficult problems because I always take them as exciting challenges.
同样，如果一个人不能处理手头的事情，他或她一定不能解决后续棘手的难题。
Likewise, if one cannot deal with the things in hand, he or she must fail in the following knotty problems.
到他14岁的时候，他已经自学了高等数学，这也是他能够解答这道难题的原因。
By the time he was 14, he had studied advanced math on his own. It was the reason that he could answer the difficult math problem.
学生平均每天要花三个小时来完成作业，但是如果遇到难题，完成作业的时间就得延长。
On average, students have to spend 3 hours finishing homework every day, but if we are stuck by difficult questions, the time will be extended.
一个问题是我没有IT背景，有时候在面试中被问到一些技术性的难题，我无法回答。
One problem is I don't have a background in IT and sometimes I get asked difficult technical questions during interviews which I just can't answer.
美国有一个问题，通常只有有钱人家的孩子才能去最好的学校上学，而这实际上是一个难题。
We have a problem in the United States that usually only wealthy kids go to the best schools and it's kind of a problem actually.
专家们一致认为在未来几十年内将出现一个难题：如何在不破坏地球的情况下养活90亿人口。
Experts agree that the next few decades will present a puzzle: how to feed nine billion people without wrecking the planet in the process.
存在一些技术上的难题，但我相信在未来的5到10年里，我们将会建设商用的海洋涡轮发电场。
There are a few technical difficulties, but I believe in the next five to ten years we will be installing commercial marine turbine farms.
试图确定新几内亚的狩猎者和采集者面临着一个众所周知的难题：界定什么是狩猎者-采集者群体。
Attempts to identify New Guinean's hunter-gatherers face the well-known difficulty of defining what constitutes a hunter-gather group.
另一组无助的孩子仅仅因为解决了简单的问题就得到了奖励，这样并没有提高他们解决数学难题的能力。
Another group of helpless children who were simply rewarded for their success on easier problems did not improve their ability to solve hard math problems.
曼谷墨西哥菜连锁饭店SunriseTacos 的老板格雷格·兰格说，他最大的难题是弄到鳄梨。
Greg Lange, the owner of Sunrise Tacos, a Bangkok chain of Mexican-food restaurants, says his biggest problem is getting avocadoes.
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