同样要注意，一个child不一定就占用一个“单元”，它可能占用由一个行和列区间组成的一个矩形。
Again note that a child may occupy not necessarily a single "cell" but rather a rectangle made of ranges of columns and rows.
同样要注意，一个child不一定就占用一个“单元”，它可能占用由一个行和列区间组成的一个矩形。
Again note that a child may occupy not necessarily a single "cell" but rather a rectangle made of ranges of columns and rows.
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