[ 'væksi:n ] 柯林斯星级 ★★☆☆☆ BNC词频 8303 COCA词频 4173 n. 牛痘苗, 疫苗 a. 疫苗的, 牛痘的 n. immunogen consisting of a suspension of weakened or dead pathogenic cells injected in order to stimulate the production of antibodies 复数: vaccines 英汉双解字典由 ECDICT 提供