But nearly twenty years, the risk of transmission of infection in transfused blood brought much trouble on transfusion.
但近二十年来，由于血源性传染疾病的威胁，给临床输血带来极大的困难。
Removing the foreign white cells from transfused blood reduces the chances of a negative reaction by the host immune system.
从输入的血液中清除外来的白细胞可以减少外来白细胞与宿主免疫系统发生负反应的机会。
In many cases the transfused blood modifies a person's immune system? Either in a favorable or unfavorable way? By interacting with the patient's own white cells.
在很多病例，输入的血液调节了患者的免疫系统。输入血液的白细胞与患者自身的白细胞互相作用，这是有益的还是有害的。
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