“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。
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。
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