halfnutn.对开螺母halfn.一半；下半场；半学年adj.一半的；不完全的adv.一半地；不完全地half-duplex link半双工链路half keystone ring单面梯形活塞气环half-space model半空间模型half-hard rubber半硬质胶half-period lune半周期半月形half-duplex mode半双工方式half ordinary rate半普通费率half-price store半价出售的商店, 减价出售的商店halfwave potential半波电位half-tone method半色调法