This paper proposes a dynamic simplification algorithm for the terrain model based on the Triangle Subdivision Bi tree to realize continuous view dependent multi resolution rendering of terrain mesh.

为实现地形漫游，提出基于三角形二叉树的地形网格模型动态简化算法，实现了与视点相关的连续多分辨率简化及快速动态绘制。

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Methods: All patients with severe ventricular hemorrhage in this group were treated by continuous irrigation of urokinase under bi lateral ventricular intubation and drainage of lumbar cisterna.

方法：对重度脑室出血的病例行双侧脑室插管尿激酶持续冲洗及腰池持续引流治疗。

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Methods: All patients with severe ventricular hemorrhage in this group were treated by continuous irrigation of urokinase under bi lateral ventricular intubation and drainage of lumbar cisterna.

方法：对重度脑室出血的病例行双侧脑室插管尿激酶持续冲洗及腰池持续引流治疗。

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