host versus graft reaction

例句：

1. 1. The host-versus-graft reaction is a complex process thatoccurs when cells from different organisms comeinto contact.
   宿主与移植反应是一个复杂的过程，当不同生物体的细胞接触时会发生。
2. 2. In the host-versus-graft reaction, the immune system recognizes and attacks the foreign tissue.
   在宿主与移植反应中，免疫系统识别并攻击外来组织。
3. 3. The host-versus-graft reaction is crucial for the survivalof transplanted organs.
   宿主与移植反应对于移植器官的生存至关重要。