vascular abnormality of umbilical cord

例句：

1. 1. The vascular system isresponsible for delivering oxygen and nutrients to thebody's cells.
   血管系统负责将氧气和营养物质输送到身体细胞。
2. 2. Vascular disease is a common cause ofheart attacks and strokes.
   血管疾病是心脏病和中风的常见原因。
3. 3. Bloodvessels are essential for carrying blood throughout thebody.
   血管对于全身血液的运输至关重要。