Both vena cavas [sic] are veins, which bring blood towards the heart.

上、下静脉均为静脉，运送血液回到心脏。

Also, a filter can be surgically placed in the inferior vena cava to prevent pulmonary embolisms.

也可以放置下静脉滤器来防止肺栓塞的发生。

CT scan or MRI help diagnose ascites, cirrhosis, splenomegally or vascular alterations like inferior vena cava dilatation.

CT或MRI有助于诊断腹水、肝硬、脾肿大，或血管病变（如下静脉扩张）。

Even partial compression of the superior vena cava can cause the venous pressure behind the obstruction to increase.

局部压迫上静脉甚至能造成阻断后方的静脉压升高。

But in some situations, an obstruction may prevent blood flow from the portal vein towards the inferior vena cava.

但有时从静脉到下静脉的血会受阻。

Got it. Wait, I-I think I can localize the bleeding. I think it's coming from the inferior vena cava.

搞定。等等，我想我可以把血止住了。我想它是从下静脉出来的。

This happens when there's an obstruction in the passage of blood from the portal vein towards the vena cava.

当血液从静脉静脉的通道阻塞时，就会发生这种情况。

In place of a nerve, they were convinced that a vena amoris—or “lover's vein”—connected this digit with the blood-pumping organ.

不过，他们相信的不是神经，而是一条“爱之静脉”（vena amoris），认为这根手指与心脏之间有直接的血液联系。

On the right side, the superior vena cava, ascending aorta, right ventricle, left ventricle, and inferior vena cava should all be visible.

在心脏右侧，分别是上静脉、升主动脉、右心室、左心室和下静脉。

The superior vena cava is found in the upper chest.

上静脉位于上胸部。

Ultimately, all of the blood ends up in the superior or inferior vena cava and dumps into the right atrium.

最终，所有的血液都回至上静脉和下静脉，最终抵达右心房。

Lastly, G is for great vessels which includes the superior vena cava, inferior vena cava, ascending aorta, aortic arch, pulmonary artery, and descending aorta.

最后，G指大血管" Great vessels" ，包括了上静脉、下静脉、升主动脉、主动脉弓、肺动脉与降主动脉。

Blood from the upper body returns via the superior vena cava, blood from the lower body returns via the inferior vena cava.

上半身血液通过上静脉回，下半身血液通过下静脉回。

The superior vena cava resembles a drain that leads down into the heart.

上静脉像通心脏的引管。

Once the liver processes all these substances, it sends the blood to the heart through the inferior vena cava to enter the systemic venous system.

一旦肝脏处理了所有这些物质，肝脏将血液通过下静脉进入体静脉系统送往心脏。

So, if you think about it, the blood that drains into the inferior vena cava has to move upward, against gravity.

所以，如果你仔细想想，入下静脉的血液必须上动，对抗重力。

So far, we've learned that blood returning to the heart from head to toe drains into the superior and inferior vena cava.

到目前为止，我们已经了解到，血液从头到脚回心脏，入上下静脉。

A Pancoast tumor in the right lung apex can also compress a large vein called the superior vena cava which drains blood from the head, upper chest, and arms.

右侧的肺上沟瘤还会压迫上静脉；上静脉汇集头部、上胸部和上肢的血液。

The job of the superior vena cava is simple, and like many other major veins in the body, it is nothing more than a transportation tube.

上静脉的作用很简单，和体内其他许多主要静脉一样，它不过是一个运输管。

The venae cavae has two divisions: the superior vena cava and the inferior vena cava, and these divisions both return blood to the right atrium of the heart.

上静脉和下静脉，这些分支都将血液回到心脏的右心房。