N → another name for ridgepole
The absoluteness of possession pleased them, and they realized it as the first moment of their experience under their own exclusive roof-tree.
虽然他们只租了两个房间，但是他们却可以完全占用整个屋子，意识到这是他们两个人第一次领略独处一室的经验这使他们大为高兴。
The limestone is sufficiently fissured for tree roots to have breached the roof of the cave.
石灰岩裂开了足以让树根突破洞顶。
The tree top is level with the roof.
树梢和屋顶齐平。
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