The practice of skull elongation - to signify group affiliation or social status - dates back 9, 000 years.
头骨人工加长技术，它象征着的是团队内部的隶属关系或社会地位，最早使用于9000年前。
Lateral skull base tumors are rare in pediatric patients in clinical practice and are difficult in diagnosis and treatment.
儿童侧颅底肿瘤临床上罕见，诊断和治疗均存在较大的困难。
From the practice, the material skull and the main problems for reacting furnace are analyzed and studied, then the paper presents the modification.
本文从生产实际出发，对反应炉的主要故障“物料结壳”进行了认真分析和研究，并实施了改造。
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