This paper describes a technique for augmenting the process of 3d direct manipulation by automatically finding an effective placement for the virtual camera.
阐述通过自动寻找虚拟相机的有效位置以增强3d直接操作过程的技术。
Some effective measures have been taken in the placement of concrete to control the occurrence of crack and to ensure the construction quality and appearance quality.
混凝土的浇筑采取了有效的施工措施，控制了裂缝的产生，保证了混凝土施工质量及表面外观质量。
Conclusion: (1) Placement of metallic stent is an effective method for treating tracheal stenosis.
结论：(1)气管内支架是治疗气管狭窄的一种行之有效的方法。
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