translation.en: But the solution is animal tissue because it's plentiful, it's cheap, you can get it from young, healthy tissues, but the barrier is immunology.
translation.zh: 随后我们用动物组织进行替代 因为生物组织可以随处找到，并且价格也不高 并且可以得到年轻、健康的生物组织 但是，该种方法的障碍就是免疫问题