假如所谓危险的万能供血者能避免，用O型血给非o型血者大量输血的实践似乎没有伤害。
The practice of using o blood for massive transfusions of non-O recipients did not seem harmful provided that so-called dangerous universal donors were avoided.
O型血的人只能接受O型血，但O型血的人却是万能供血者，因为O型血可以被所有血型的人接受。
Blood type o can receive only o blood but are "universal donors" because o is acceptable to all other blood types.
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