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。
In this mode, producers and consumers can indicate that they are trying to insert or remove items from any BlockingCollection in the list, but they don't care which particular one is chosen.
在这种模式下，生产者和消费者可以指明为任意一个BlockingCollection添加或删除元素，而不在乎某个特定的集合。
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