This construct is useful when you want to capture one of a number of alternative matches in a single sub-expression index.
当你想用单个子表达式索引捕获多个可选匹配之一的时候，可使用该结构。
Objective To evaluate the left ventricular diastolic function in hypertension with a new echocardiographic expression index of left atrial geometry.
目的以左心房构型超声新表达指标评价左心室舒张功能的改变。
Objective To evaluate the left ventricular diastolic function in hypertension with a new echocardiographic expression index of left atrial geometry.
目的以左心房构型超声新表达指标评价左心室舒张功能的改变。
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