AIM: To introduce the characters in different materials of intervertebral fusion cage, and investigate effects of different fusion cages in clinical application.
目的：介绍各种不同椎间融合器在材料上的特点，以及不同椎间融合器的临床应用效果。
Aim at the characters of spatial data access control, the concept of spatial region access control based on spatial index was proposed.
针对空间数据的访问控制的特点，提出了基于空间索引的区域访问控制概念。
AIM: To compare the clinical characters of patients with dementia with Lewy bodies or with progressive supranuclear palsy, and differentiate those from other kinds of Parkinson Plus.
目的：比较路易体痴呆及进行性核上性麻痹的临床特点，并与其他的帕金森叠加综合征相鉴别。
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