来自《耶鲁大学开放课程：生物医学工程探索 第13集 第13集》

• 
  
  This is a picture of the heart.
  这张图是心脏
• 
  
  It sits--about the size of your fist,
  它与你的拳头差不多大
• 
  
  basically in the center of your chest,
  大致位于胸部中央
• 
  
  but shifted a little bit to the left hand side.
  会偏左手边一点
• 
  
  You can find out where yours are by just putting a finger there
  只要把手指放在这儿 感受到心跳
• 
  
  and feeling where you can feel the heartbeat,
  就能找到心脏
• 
  
  it's fairly easy to define.
  确定位置很简单
• 
  
  The apex of the heart,
  心脏的顶部
• 
  
  the tip of it sits downward like that
  心脏的尖端在下方
• 
  
  and the major vessels are near the center line;
  主要血管位于心脏中心线附近
• 
  
  so the tip is down here,
  因此尖端在下方这里
• 
  
  the major vessels are near the center line.
  主要的血管位于心脏中心线附近