1. A narrowing or constricting, especially of the aorta or of a blood vessel. 
   变窄尤指血管或大动脉的变窄或收缩
2. Examination of the aorta using x-rays following the injection of a radiopaque substance. 
   主动脉造影术在注射防辐射线穿透的物质后用x射线对主动脉进行的检查
3. the contraction of the chambers of the heart (especially the ventricles) to drive blood into the aorta and pulmonary artery. 
   心脏各室的收缩，收缩时把血液压入大动脉和肺动脉。
4. The membranous sac filled with serous fluid that encloses the heart and the roots of the aorta and other large blood vessels. 
   心包囊状膜层，其间充满了包围着绕心脏、大血管的根部和其它大血管的浆状液体
5. The chamber on the left side of the heart that receives arterial blood from the left atrium and contracts to force it into the aorta. 
   左心室位于心脏左侧的心室，从左心房接收动脉血并收缩把血压入主动脉

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• 1. 主动脉
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• 2. 大动脉
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