These structures are called Passage Graves, because the inner chamber, sometimes several chambers in fact, could only be entered from the outside through a narrow passageway.
这些结构被称为通道式坟墓，因为这里的内室，有时实际上是几个房间，都只能从外面通过一个狭窄的通道进入。
Only one passageway to be used, the high sealed-space utilization, better appearance and practical, widely used in archives, library, band and company document, etc.
它仅需设一个通道，密封性好，美观实用，是空间利用率最高的一种货架，主要适用于档案馆、书馆、行、业资料室等。
There is only one narrow passageway up the steep mountain.
那座险峻的山上只有一条羊肠小道。
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