Vaccinations , Inoculations , Immunizations , Travel Health - Canada - Treehouse Cityguide.
接种，免役，旅行健康-加拿大-树房子游客指南。There is no evidence that the exo-erythrocytic stages in the liver produce any significant degree of immunity.
并无证据证明在肝内的红细胞外期，可产生任何有效程度的免役。I personally feel that immunization is not easy to learn.
我个人觉得免役学学起来不容易。Makesure your immunizations are up-to-date. You are at higher risk for infections.
确定您的免役最新。您是在更高的风险为传染。Genetic analysis pushes the estimated origin of HIV back to between 1884 and 1924, with a more focused estimate at 1908.
遗传分析推测出爱滋病毒（人类免役缺陷病毒）的起源可追溯到1884-1924年之间，然尔，更多的学者将焦点放在1908年。The immune system, which is responsible for tissue rejection, will easily recognize the tissue as foreign and will reject it vigorously.
负责组织排斥的免役系统将很容易地识别出外来组织并强烈排斥它。Malnourished children are even more susceptible to being infected because of their weakened immune systems.
营养不良的儿童因为免役系统变弱甚至更容易被感染。Suffering from sudden hair loss is a sign of immune disease.
头发突然脱落是患免役性疾病的征兆。The Social Stratum Change and the Law of Service Exemption Institution Innovation in Northern Song Dynasty
北宋社会阶层变动与免役法制度创新