复制字段值。
Tables: This field is the list of tables that were selected in the copy operation.
Tables：这个字段是复制操作选择的表的列表。
For example, you can join two fields together and copy them into one output field.
例如，您可以将两个字段连接在一起，然后将它们复制到一个输出字段中。
Select all the text in the Address field and copy it to the clipboard.
选择address字段的所有文本，并将其复制到剪贴板。
If the field is a value type, a bit-by-bit copy of the field is performed.
如果字段是值类型的，则对该字段执行逐位复制。
If the field is a value type, a bit-by-bit copy of the field is performed.
如果字段是值类型的，则对该字段执行逐位复制。
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