external LU外部逻辑单元externaladj.外来的；外部的；外面的；表面的n.外观；外部；外界事物External trauma disease创伤疾病external reference coil参比线圈external tapered thread圆锥外螺纹external honing machine外圆珩床external transmigration外移行external advisory panel行外顾问组external thread grinder外螺纹磨床external kinetic energy外部动能external qualifier line外部限定线路external transmit clock外部发送时钟

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。