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 change自愿改变voluntary intake自由采食量voluntary school民办学校voluntary ptosis随意性上睑下垂voluntary victim自愿的被害人voluntary muscle随意肌voluntary answer自发答辩voluntary labour义务劳动voluntary office[法] 义务职voluntary theory利益说