层次索引模板通过一组常驻显存的索引缓存序列，隐式地表示地形块细节层次。
It represents terrain blocks detail levels by using an index buffer sequence, which resides in video memeory.
系统采用客户资源索引缓存机制和“迭代深入”的查询转发机制，提高了搜索的效率和成功率。
Client resource index caching mechanism and the iterative query forward mechanism are adopted in the system design to enhance the search efficiency and success ratio.
如果选择这个选项，将为主题视图创建一个内部缓存或索引。
Selecting this option creates an internal cache or index for the threaded views.
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