If we add a widget to a grid, we can provide row span and column span of the widget.

如果我们将一个组件加入到栅格，我们可以提供组件的行跨度和列跨度。

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After negotiating the labyrinth of security, coat checks and corridors, we were ushered into three seats in the front row of Gallery booth No. 7, less than two feet behind the C-SPAN cameras installed there to monitor the proceedings.

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