In the above command, X, Y, and Z are used as placeholders.

在上面的命令中，X、Y和Z作为占位符。

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The When attribute value of Y means that the command should be executed for each item that evaluates to true.

Y的when属性值表示应当为计算结果为真的每个项目执行该命令。

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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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