They appealed to the young men to volunteerforservice.
他们呼吁青年人主动服兵役。
2
Many of them volunteerfor community service with disadvantaged people.
他们中的许多人自愿为弱势群体提供社区服务。
3
After that, Walters essentially withdrew from public life, spending a lot of time hiking in the San Gabriel Mountains outside Los Angeles and doing volunteer work for the U.S. Forest Service.