“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。
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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