President Obama said the government will make it easier for workers at small businesses to automatically enroll in retirement savings plans.

VOA: standard.2009.09.05

Now, the problem, or one of the challenges with clinical trials of vaccines is that you have to enroll a lot of patients into clinical trials because only a few are going to get sick in any case, only 20 out of 100,000.

现在的问题是,这也是疫苗临床试验的挑战之一,临床试验必须包括足够多的病人,毕竟只有一小部分人会被传染,十万人里面只有二十人被传染

耶鲁公开课 - 生物医学工程探索课程节选

For most of them,everything's rosy. Once dismissed as lowly junior colleges and commuter schools in urban areas where students could walk or take public transit to class, these two-year colleges are attracting tens of thousands of students who would normally enroll in four-year private or state universities.

VOA: standard.2009.12.14

Fourteen-year-old Nam Gao says that when she moved to Thailand three years ago, her parents tried to enroll her in a Thai school.

VOA: standard.2010.02.24