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· 英译中

原文：

      UNTIL THE 1940s, blood transfusions often went wrong because some of the main blood-group systems, such as the Rhesus factor, had yet to be discovered. This hit or miss approach to matching donors with recipientsis now a thing of the past, as tests for all sorts of characteristics of an individual’s blood have become available. But finding a well-matched donor can still be difficult. Some patients have blood types so rare that there may be but a handful of appropriate donors in the country where they live.

译文：

      上世纪40年代前，由于恒河猴因子之类的主要血型系统尚未被发现，输血经常发生问题。由于对个人血液各种特征的检测都已成为可能，这种对于供者与受者配对的碰运气式方法如今已成为过去。但要找到匹配良好的捐赠者依然困难。因为有些患者的血型非常罕见，其所在国可能只有少数合适的捐献者。