It is not necessary to enroll before the course starts.

不需要在课程开始前注册。

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They do not have Thai citizenship or language skills - making it difficult for them to enroll in Thai schools.

VOA: standard.2010.02.24

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

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

Mr. DICKSON: It asked--the first question asked, is the patient eligible to enroll in Medicaid?

NPR: Aid Arrives at Arizona Hospital as Immigrants Dry Up

He won by a 23% margin among voters 18-29--just the people who need to enroll.

WSJ: Crunch Time

Encourage your workers to enroll in the plan and teach them how to use it.

FORBES: Small Biz Can Save Retirement