Leads II, III, and aVF are " inferior" leads because they're near the inferior wall of the heart which receives blood from the right coronary artery.

II、III和aVF导联为“下壁导联”，因为它们靠近心脏的下壁，这个区域接受右冠状动脉的血液供应。

The right coronary artery are RCA supplies the right ventricle through a marginal branch which arises near the origin of the vessel.

右冠状动脉（RCA）通过边缘分支供血右心室，该分支在血管起点附近。