All volunteers were African American, a high-risk group for heart disease.
所有的志愿者都是非洲裔美国人，他们是心脏疾病的高发人群。
The group is currently looking for volunteers to join the study.
这个团队目前在寻找愿意参加这项研究的志愿者们。
The research team also studied a group of volunteers who watch birds for fun.
该科研小组还研究了一群以观鸟为乐的志愿者。
The research team also studied a group of volunteers who watch birds for fun.
该科研小组还研究了一群以观鸟为乐的志愿者。
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