But the president reminded an enthusiastic crowd of Democrats that solving long-entrenched problems is a difficult process.

VOA: standard.2010.02.06

Also we will have students doing workshops and problem-solving where the students will solve problems as a group, a group of three and turn in a common work sheet.

我们还有学生做研讨会,以及问题解决,从而学生可以以三人小组为单位,解决问题,最后上交平常的作业。

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