A: the north wind is biting and I'm frozen to the bone. A.

北风刺骨，我都快冷冻透了。

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Objective: To investigate the rejection mechanisms of bone xenograft by comparing the immunoreaction of frozen dried bone xenograft with that of bone allograft.

目的：通过比较冻干同种与异种骨移植免疫反应，探讨异种骨移植排斥机制。

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AIM: To investigate the effects of deep-frozen treatment on the immune response of bone-patellar tendon-bone (BPB) xenograft rejection.

目的：观察深低温处理对异种骨-髌腱-骨(bpb)移植排斥反应的影响。

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