As background, they note that people are strongly motivated to gain social acceptance, and thus are highly sensitive to rejection.
作为背景，他们指出人们是在获得社会承认方面有很强积极性的，因此对拒绝很敏感。
2
Background Endomyocardial biopsy is the standard method of monitoring for rejection in recipients of a cardiac transplant.
背景心内膜心肌活检是对心脏移植受体进行排斥反应监测的标准方法。
3
BACKGROUND: Currently, the diagnosis of acute rejection after kidney transplantation is based on a kidney biopsy taken after clinical rejection suspicion.