首先，我们实例化一个标题行并向其添加一个左上角单元格。
First, we instantiate a header row and add a corner cell to it.
这是单元格的一种格式化选择。
同样，单元格是对其左侧单元格内容的专门化。
As before, each cell specializes the contents of the cell to its left.
他在布拉格发出无核化倡导实在是太杰出了。
It was outstanding when he made the speech in Prague calling for a nuclear-free world.
他在布拉格发出无核化倡导实在是太杰出了。
It was outstanding when he made the speech in Prague calling for a nuclear-free world.
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