Most adults are immune to Rubella.大多数成人对风疹具有免疫力。Objective To study the immunity duration of attenuated live rubella vaccine.目的了解冻干风疹减毒活疫苗的免疫持久性.Rubella and the liver.风疹和肝脏....
...symbolic representations of landscape.地貌的符号化呈现The gestures are highly stylized and symbolic.各种姿势都是高度程式化的,并且具有高度象征意义.A lot of Latin-American officials are stressing the symbolic importance of the trip...许多拉丁美洲的官员都在强调此行...