Over a period of years, FDA has progressively strengthened the overlapping safeguards that protect patients from unsuitable blood and blood products.
多年来，FDA已经逐渐加强了多重保护，防止患者使用不合适的血液或血液制品。
Over a period of years, FDA has progressively strengthened the overlapping safeguards that protect patients from unsuitable blood and blood products.
多年来，FDA已经逐渐加强了多重保护，防止患者使用不合适的血液或血液制品。
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