英语语法分析

The specimens were obtained sterilely with preservative-free heparin, and the cord blood mononuclear cell was isolated by lymphocyte separation medium.

无菌条件下取正常足月剖宫产胎儿的脐带血，经肝素抗凝，用淋巴细胞分离液分离脐血单个核细胞。