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objective to study the diagnosis and operative treatment of foramen magnum tumors.methods the clinical presentations,mri images, operative technique and prognosis of 9 cases with tumors of the foramen magnum were analyzed retrospectively.results 5 cases got total removal, 3 cases got subtotal removal, and 1 case got partial removal.conclusion acquaintance with anatomy of foramen magnum region,microsurgical technique,suitable surgical approach and post--operative management are closely related with the therapeutic effect.

目的 研究枕大孔区肿瘤的诊断与手术疗效。方法回顾性分析9例枕大孔区肿瘤的临床表现和mri影像，手术技巧和预后。结果全切5例，次全切3例，部分切除1例。结论熟悉枕大孔区解剖，运用显微外科技术，选择合适手术入路，注重术后处理，都与疗效密切相关。

In this case, the study of residual stress in ferroelectric thin film is very important.

因此铁电薄膜残余应力研究是关于铁电薄膜制备和性能研究的重要内容。

Methods:Pair matching case-control study with 180 cases of SARS and 180 contr ols was univariate analysis.

应用 1：1配比的病例对照研究方法对 SARS病例与正常对照进行研究。采用条件 L ogistic回归分析方法进行资料分析。

By the study of the case of CG Co..

本文针对山东潍坊CG路桥工程公司的质量管理问题进行案例研究。

Paul Woolley, who set up the Centre for the Study of Capital Market Dysfunctionality at the London School of Economics, argues that this is a classic case of a principal-agent problem.

Paul Woolley——伦敦经济学院资本市场功能失调研究中心创始人——争论道，这是委托人-代理人问题的经典案例。

In a nested case-control study from the Providence, R.I., cohort of the Collaborative Perinatal Project, 27 adults with schizophrenia and other psychotic illnesses and 54 controls were matched for sex, ethnicity, and birth date.

在美国罗德岛州普洛威斯顿市的一项病例与对照组的周产期合作研究中：试验组包括27名精神分裂症和其他精神疾病患者，对照组包括54人，两组的年龄、种族和出生日期可相匹配。

Comment: In this case-control study, current PPI use was associated with CAP.

评论：在这个病例对照研究中，正在使用PPI和CAP是相关的。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。