钙属于混晶型杂质，必须预先分离。
Calcium belongs to mixed-crystal impurity and must be removed in advance.
该文主要介绍在不对纤维组分进行预先分离的条件下，纤维化学特性的表征技术。
Direct characterization technologies for chemical analysis of fibers, without a previous separation of the components or component groups from each other, were reviewed.
同时由于脐血库液氮保存设备费用昂贵，需要预先分离脐血单个核细胞以减少样本冻存体积，以满足建库实际需求。
Cord blood separation and volume reduction is first needed to meet THD practical bank requirement for the high expense of liquid nitrogen preservation equipment.
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