volunteerism
noun [uncountable] (especially North American English)the practice of working as a volunteer, especially in community service 志愿服务： 作为志愿者的实践，尤其是在社区服务中- (also voluntarism)
the practice of using or relying on volunteers rather than paid workers 志愿服务： 使用或依靠志愿人员而不是带薪工人的做法