a person who gives permission for a part of their body to be taken, while they are alive or after they are dead, and put into someone else's body to replace an organ that is not working correctly

Families of patients declared brain dead could override that person's decision to be an organ donor. 被宣布为脑死亡的病人家属可以推翻此人捐献器官的决定。

There's no denying that living organ donors, for example kidney donors, put themselves at risk by undergoing surgery. 不可否认，活体器官捐献者，例如肾脏捐献者，会因为接受手术而给自己带来危险。