He says it is important to get young people involved in volunteer work at an early age.

VOA: special.2009.07.01

Now at Harvard Thinks Big I happened to tear into this thing myself and it would seem a little pointless to re-hash that same demo so instead I thought I'd solicit an ideally sufficiently strong volunteer to come on up.

现在在“哈佛大梦想”的讨论会上,我反复思考这件事,觉得再演示一遍似乎意义不大,因此我想找一位合适的志愿者,上讲台来。

哈佛公开课 - 计算机科学课程节选

I volunteer with an organization called "Divine Possibilities",

我在一个叫做“神圣的可能性”的组织做志愿者，

求职攻略 - SpeakingMax英语口语达人

Kathleen Kaye has been an Experience Corps volunteer for more than three years.

VOA: special.2010.07.16

After Katrina hit, he was an emergency volunteer in Biloxi,Mississippi.

VOA: special.2010.01.22

The United States had conscription during the Vietnam war era, which fueled massive antiwar protests,but today has an all-volunteer armed force.

VOA: standard.2009.09.09