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One more important note: In the following lines of code from Listing 7, broken out in Listing 8 below, the code tests each cell to make sure it's not null. 还有一个重点需要注意：在 清单 7 中的以下代码行（在下面的 清单 8 中断开）中，这段代码测试每个单元格，确保它们不为空。