d表示排序的方向(升序或降序)。
D indicates the direction of the sort (ascending or descending).
选择这些链接之一，将根据指定的字段和方向对结果集进行重新排序。
Selecting one of these links re-sorts the result set by the specified field and direction.
将用于表明排序方向的图像添加到适当的图像目录中。
Add images to the appropriate images directory that display what you want to be used to indicate the sort direction.
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