In our example, we use an address of 2 to indicate that only line 2 should be deleted.
在我们的例子中，我们使用地址2来表示只删除第2行。
The line cannot be deleted as the data entry screen automatically displays all accounts for the selected form that are defined to hold historical rates.
这行不能删除的原因是：数据输入屏幕自动显示定义来持有历史汇率的已选表单的所有账户。
The first line of code in Listing 11 calculates the number of messages to be deleted according to the formula described above.
清单11中第一个代码行根据上面的公式计算要删除的消息数量。
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