dilation of aortic valvular stenosis

例句：

1. 1. The aortic valve is the heart's main valve that regulates blood flow.
   主动脉瓣是心脏的主要瓣膜，负责调节血流。
2. 2. Aortic stenosis is a condition where the narrowing of the aortic valve causes reduced blood flow.
   主动脉狭窄是一种情况，其中主动脉瓣的狭窄导致血液流量减少。
3. 3. In aortic stenosis, the narrowed area of the aortic valve restricts blood flowto the left ventricle.
   在主动脉狭窄中，主动脉瓣的狭窄区域限制了血液流向左心室。