a substance (a virus or toxin or immune serum) that is introduced into the body to produce or increase immunity to a particular disease
双语例句
用作名词 (n.)
A suitable inoculant,such as calcium silicide or equivalent,is to be added to the metal stream as the furnace is tapped. 当熔炉运行的时候，可以在金属溶液里加一种合适的变质剂，例如钙化剂或者其他的等价物。
