Artificial neural network pattern recognition has become especially suitable for solving a class of problem.

模式识别成为人工神经网络特别适宜求解的一类问题。

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And this becomes more of a problem when colleges don't talk about the class advantages and disadvantages of different groups of students.

当大学不探讨不同学生群体的阶级优势和劣势，这就成了一个更大的问题。

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This becomes more of a problem when colleges don't talk about the class advantages and disadvantages of different groups of students.

当大学不对不同学生群体的阶级优势和劣势进行探讨的时候，问题就更大了。

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Johnson says this kind of inaccurate word choice is happening so often now that she devotes a section of her class to the problem.

VOA: standard.2010.01.16

What you're much better at doing is saying how do I take the problem I've got and map it into a class of algorithms about which I know and use the efficiencies of those to try and figure out how to make it work.

当你碰到问题的时候,更好的方法是把遇到的问题映射,到已经设计好的算法中去,并用这些算法来提高效率,来保证问题得到解决。

麻省理工公开课 - 计算机科学及编程导论课程节选

And we want to help you learn how to map a problem into a class of algorithms of some efficiency That's our goal.

学会如何将一个问题,映射到一类,提升效率的算法中去,这就是我们的目标。

麻省理工公开课 - 计算机科学及编程导论课程节选

The disagreement between the two Democrats has exposed the subtexts of race and class that lurk beneath the vexing problem of where, in a crowded city, to put undesirable facilities.

WSJ: Thompson, Quinn Recycle Trash Fight

We all know the decline of the middle class is a problem.

FORBES: How Do You Fix the Hollowing Out of America's Middle Class?

The struggles of middle-class families were a big problem long before the recession hit in 2007.

WHITEHOUSE: President Obama News Conference