Similarly, a mapping that describes the splitting of an address field into Line1, Line2, City, ZipCode would have one source column and four target columns.
类似地，如果一个映射描述的是将address字段分割为Line1, Line2, City, ZipCode，那么它将有一个源列和4个目标列。
The desc field contains the line number and the value contains the code address for the start of that source line.
desc字段包含行号，而value包含源代码行的起始部分的代码地址。
You can specify a user profile field to use as the source of the default email address when a user adds an alert.
您可以指定一个用户配置文件字段作为用户添加通知时默认电子邮件地址的来源。
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