“Let’s challenge our states to adopt world-class standards,” he said, putting his finger on a huge problem.
“我们要挑战各州（现状），采用世界级的标准，”奥巴马的这句话准确的指出了一个（教育）大弊端。
It's not the end of the world. - Can't seem to solve that one nagging math problem in class.
看起来一个恼人的数学题无法被解决。
The second class of problem comes from the world of combinatorics.
第二类问题来自组合数学界。
Class size is the problem the academic world pay attention to in the recent years and large-size class which breaks through the class-size limitation has problems.
班级规模是近些年学界比较关注的问题，而突破班级规模限制的大班教学存在许多问题。
Despite the complexity of the financial state of real world, a two-class problem has usually been considered to tackle this classification task.
尽管现实中企业的财务状况复杂多样，人们往往将财务预测当作两分类问题来解决。
The exploration and development of fractured oil and gas field has been the difficult problem of world-class.
裂缝性油气田的勘探开发是一个世界级的难题。
The exploration and development of fractured oil and gas field has been the difficult problem of world-class.
裂缝性油气田的勘探开发是一个世界级的难题。
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