This was illustrated in the wizard introduced in my previous column.
这一点在前一篇专栏文章所介绍的向导中作了说明。
I wasn't able to discuss the builder in the previous column, so I'll introduce it now.
在前一篇专栏文章中,我无法讨论这一构建器,因此我现在将介绍它。
The followpos function, which was explained in the previous column, was not implemented.
没有实现上一篇专栏文章中解释过的followpos函数。
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