标号可以在单元格内居中或居左、居右。

Alabel can be centered in the cell or positioned to the left or right.

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水只向四个方向流动（上，下，左，右），从一个单元格流向另一个等高或者更低的单元格。

Water can only flow in four directions (up, down, left, or right) from a cell to another one with height equal or lower.

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