Background and Objectives: Meningeal hemangiopericytoma is an uncommon tumor.
背景与目的：原发于脑脊膜的血管外皮瘤临床少见。
This paper includes six parts: the first part is the background and objectives of the paper.
本文共分为六章，文中第一章是研究背景及目标。
Background and objectives: Critically ill newborn is the emergent patient in neonatal department and one of the most important factors leads to death of neonate and disability of children.
背景与目的：危重新生儿为新生儿科急症，也是引起新生儿死亡和导致儿童伤残的重要原因之一。
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