腔静脉

例句：

1. 1. The heart's blood flows through the aorta and then into the aortic valve, which ispart of the aortic arch.
   心脏的血液通过主动脉流入主动脉瓣，这是主动脉弓的一部分。
2. 2. The veins carry blood away from the body, carrying oxygenated blood to the lungs.
   静脉将血液从体内带走，将富含氧气的血液输送到肺部。
3. 3. Blood vessels are essential for the transport of nutrients and oxygen throughout the body.
   血管对于整个身体输送营养物质和氧气至关重要。