只有当你的程序修改一个在场景图中隐藏很深或者经由用户交互式而被选择的节点的时候，问题才会比较复杂。
The problem becomes more complex if your application modifies a node that is buried deep within a scene graph or selected interactively by a user.
同时，系统也解决了隐藏节点和暴露节点问题。
Moreover, the hided and the exposed nodes were be avoided by the system.
KK型圆钢管搭接节点，搭接处隐藏焊缝焊接与否的问题，现行钢结构设计规范（GB50017-2003）未作明确要求。
The question whether hidden weld in unstiffened overlapped CHS KK-joints is welded or not is not clearly metioned in current code for design of steel structures(GB50017-2003).
KK型圆钢管搭接节点，搭接处隐藏焊缝焊接与否的问题，现行钢结构设计规范（GB50017-2003）未作明确要求。
The question whether hidden weld in unstiffened overlapped CHS KK-joints is welded or not is not clearly metioned in current code for design of steel structures(GB50017-2003).
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