虽然新生动物有免疫活性，但它们在出生时，一般不含免疫球蛋白。

Although newborn animals are immunocompetent, they usually possess no Igs at birth.

youdao

虽然新生动物有免疫活性，但它们在出生时，一般不含免疫球蛋白。

Although newborn animals are immunocompetent, they usually possess no Igs at birth.

youdao