编辑文本，让它包含想要的列标题，删除单元格原来的内容。
Edit the text so that it contains the desired column header, and delete to original content of the cell.
在加筋布局优化中，用单元应变能密度灵敏度作为删除单元的准则。
In layout optimization of stiffeners, the strain energy density sensitivity of the element was used to determine which elements of stiffeners should be deleted.
简单地使用del键将只会从图表中删除单元，而不是从拓扑图模型中删除。
Simply using the del key would remove the unit from the diagram only, not from the topology model.
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