Perform calculations and updates on the grid.
在网格上执行计算和更新。
Don't perform calculations using a pure Ruby approach, as is shown in Listing 10.
所以请不要使用纯ruby的方式执行计算，如清单10所示。
Until now, the smallest such area for which researchers could perform calculations was 20 square kilometers.
直到现在，研究者们可以用来计算的最小的面积也有20平方公里。
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