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" ，包括了上脉、脉、升动脉、动脉弓、肺动脉与降动脉。

The descending aorta is divided into two sections that are named for their location.

降动脉分两个部分，以其位置命名。

In this lesson, you will learn about the descending aorta, which begins at the aortic arch and is divided into two sections, the thoracic and the abdominal aorta.

本节课，我们将学习降动脉，动脉弓开始，分两部分，胸动脉和腹动脉。

After exiting the heart, the aorta makes a U-turn at the aortic arch and becomes known as the descending aorta as it plunges down through the thorax and abdomen.

动脉离开心脏后，在动脉弓处作一个U形转弯，当穿过胸和腹部时，被称降动脉。

The main thing to note about the descending aorta is that it has a number of branches coming off of it, much like back roads would come off of a highway.

关于降动脉，需要注意的要问题是有许多分支降动脉上分支，就像小道高速公路上分支一样。