岩石尖尖的表面剐到了她的皮肤,令她后缩了一下。
The sharp surface of the rock caught at her skin, making her flinch .
目的:比较保留瓣下结构与不保留瓣下结构二尖瓣置换术(MVR)后的左室构型、左室功能的变化。
Objective:To compare the changes on the configuration and the function of left ventricle after two types of MVRs with structure preserved or removed.
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