external blood

• 外周血

external blood的用法和样例：

例句

1. Currently, EPCs have been identified in adult peripheral blood, bone marrow, and human umbilical cord blood.
   目前，内皮祖细胞已被证实存在于成年人外周血，骨髓和人脐带血中。
2. They are infrequent in a normal peripheral blood smear, and their significance is uncertain.
   它们在正常的外周血涂片中是很少见的，而且它们的意义还不确定。