它是指全展滑轨从柜子前部展开的长度。
This is how far a full extension slide extends past the front of the cabinet.
由此，网络的总展开长度在增加节点后反而得以缩短！
Therefore the total unraveled length of a network can be shortened by adding nodes to it!
通过展开给定的条目名称并获取完整的名称和长度，获得引用。
The reference is obtained by expanding the given entry name and retrieving the complete name and length.
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