U - number of unknown answers in the first pass of the repetition, i.e. the number of questions that have one or more dots in their first column of the repetition scores field.
U-没答对问题的个数，也就是在重复学习评分栏里有一个或多个点的问题个数。
By putting a bar code data field in a label or envelope publication, you indicate where you want information from the bar code column to appear in the printed copies.
通过将条码数据域放在标签或信封出版物中，您可以指定希望条码列中的信息在打印出的副本上显示的位置。
If you prefer to drag fields from the field list to the drop zones, you can... this is also the answer to how you add fields to the Filter or Column drop zones.
如果你喜欢从字段列表中拖拽字段到拖拽区域，你可以这么做……这也是怎样添加字段到筛选或列拖拽区域的答案。
One-to-one relationship or NULL field for optional column?
一对一的关系或空字段为可选的列？
For each non-NULL variable-length field, the record header contains the length of the column in one or two bytes.
对于每个非空的变长字段，记录头使用一或两个字节包含了列的长度。
For each column in the view, you need to specify where to display the field (top, bottom, or hidden) and on what line as shown in figure 7.
对于视图中的每个列，需要指定在哪里(顶部、底部还是隐藏)以及哪一行上显示字段，如图7所示。
If two or more columns of the result have the same field names, the last column will take precedence.
如果结果中的两个或以上的列具有相同字段名，最后一列将优先。
If two or more columns of the result have the same field names, the last column will take precedence.
如果结果中的两个或以上的列具有相同字段名，最后一列将优先。
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