其实我觉得每个吸血鬼的理论不一样，所以这道题的答案有很多。。(help me! )
If vampires survive by consuming blood, how could they avoid the immune response problems that affect blood transfusions for regular humans? (Hint：Consider both the antigens and antibodies of the vapire and their victims.)
wordbank:
consume 消耗
immune 免疫（系统）
antigens 抗原
antibodies 抗体
victims 牺牲者
ok。。这可是正经的学校生物课的作业啊！！
话说我觉得这和人可以吃不同的带血的牛排应该道理是一样的，因为只是过了消化系统。。。诶。。。