Preliminary study of real-time three-dimensional echocardiographic planimetry of the mitral valve area before and after percutaneous balloon mitral valvuloplasty是什么意思_Preliminary study of real-time three-dimensional echocardiographic planimetry of the mitral valve area before and after percutaneous balloon mitral valvuloplasty在线翻译_英语_读音_用法_例句