Bad: Sometimes a schema indicates that a data item is optional when some other part of the system downstream fails without the data. Here is an optional element in XML schema.
不好的方法：有时候模式中会指示数据项为可选，但系统中其他的部分却可能因为这部分数据的缺失而失败。
Objective:To conduct such a study on TSS downstream of mitral stenosis using a finite element model of two dimensions combined with Doppler echocardiography in human beings.
目的探讨一种与多普勒超声相结合的人体二尖瓣狭窄下游湍流剪应力二维有限元分析方法。
Objective:To conduct such a study on TSS downstream of mitral stenosis using a finite element model of two dimensions combined with Doppler echocardiography in human beings.
目的探讨一种与多普勒超声相结合的人体二尖瓣狭窄下游湍流剪应力二维有限元分析方法。
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