Quantitative Tissue Velocity Imaging for Evaluating the Effects of Different Atrioventricular Delay on the Left Ventricular Systolic Function in Patients with Dual-chamber Pacing是什么意思_Quantitative Tissue Velocity Imaging for Evaluating the Effects of Different Atrioventricular Delay on the Left Ventricular Systolic Function in Patients with Dual-chamber Pacing在线翻译_英语_读音_用法_例句