Having implemented this new vertical copy behavior inside LookUpwards , all that remains is to override the standard CTRL-Y command in Insert mode, using an imap.

在LookUpwards内部实现了这个新的纵向复制行为后，剩下的工作就是在Insert模式中覆盖标准的CTRL - y命令，使用下面的imap。

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That is, it copies the character in the same column from the line immediately above the cursor. For example, a CTRL-Y in the following situation would insert an "m" at the cursor.

也就是说，它将从紧挨着游标的上一行中复制同一列中的字符。

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