barring?match？

During those years, I learned way more than I could have ever taught. I learned that for nearly all hospitals outside of the capital, the closest thing to a blood bank was the antecubital fossa of relatives and individuals like myself willing to donate blood in real time for a loved one or patient. If a patient needed two or three units of blood, then we needed two or three family members to lend their arms (barring they are a match of course).

那些年，我学到的远比我教给当地医生的多。在肯尼亚，除了首都，几乎所有的医院的血库就是人，也就是随时愿意献血去拯救亲人或其他患者人的肘窝。如果一个患者需要2到3个单位的血液，那么我们需要两三个家庭成员伸出他们的手臂（当然除非血型匹配）

barring?

barring : 来自bar,杆，棍，阻拦。原指挡开的，后指除外。

1.除…以外，不包括：

Nobody else knows, barring you and me.

除你我以外，无人知晓。

2.除非：

Barring accidents, we'll be there.

除非发生意外，我们会去那儿的。

看例句。barring相当于except，而不是besides

把“血型匹配”的排除在外？输血型不对的血？

那是不是match 理解有误？

要么match这里不是血型匹配的意思，而是对手的意思。如果这样，应该翻译为，“当然除非他们关系不睦”也就是说，如果家人是对手，或者有冲突的，不会来帮助献血的？

谢谢