总的来说，当今的老年人依然相对贫困。As a group, today's old people are still relatively deprived.他是当今英语世界中文采最好的。He is the finest stylist in the English language of today.当今，人们越来越长寿，受教育程度也提高了。People live longer nowadays, and they are ...
Antigen interacts with the surface of sensitized mast cells.抗原与致敏的肥大细胞表面互相作用.Another method of maintaining antigen persistence is through use of an adjuvant.使用佐剂是保持抗原持续存留的另一方法.Antigen density on the tumor cell surface in...