优选地，所述角板包括允许该角板在通常平面的位置和成一定角度的位置之间移动的活动铰链。
The corner panels preferably include a living hinge that allows the corner panel to be moved between a generally planar position and an angled position.
优选地，所述角板包括允许该角板在通常平面的位置和成一定角度的位置之间移动的活动铰链。
The corner panels preferably include a living hinge that allows the corner panel to be moved between a generally planar position and an angled position.
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