但现在国内外对一些在工程中常见的KT型和KX型空间相贯节点的研究还很少，给这类节点的推广和应用带来的不便。
But now, the research on the multiplanar KX -, KT-joints that have been used in many projects is little, which brings some inconvenience to the extension and application for this type of joints.
随着螺栓球节点网架在悬挂吊车工业厂房中的推广应用，其疲劳性能成为工程界多年来尚待解决的热点问题。
With the popularization and application of this structure in industrial factory with suspended crane, the fatigue performance becomes the hot problem to be solved for many years in engineering circle.
树是除根节点外其余的节点均为0的四叉树，它是零树的一种推广。
An X-tree is a spatial hierarchical tree whose all nodes are 0 except the root node. It is the generalization of the zero tree.
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