voluntary act自愿行为
voluntaryadj.自愿的;志愿的n.(教堂礼拜仪式前后或进行期间的)乐器独奏
voluntary payment of tax[经] 自动(愿)缴纳税款
voluntary nervous system随意神经系,自主神经系统
voluntary administration自愿管理程序
Voluntary or spontaneous自愿的;自发的
voluntary community work义务社区服务
voluntary closing device随意闭合装置
Voluntary wheel exercise自愿转轮运动