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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. 還有一個重點需要注意：在 清單 7 中的以下代碼行（在下麪的 清單 8 中斷開）中，這段代碼測試每個單元格，確保它們不爲空。