目的：探讨桥小脑角区巨大肿瘤术后并发非术区硬膜外血肿的机制、特点及原因，以期提高对这一并发症的认识及预防。
Objective: To explore the mechanism, characteristics and the causes of extradural hematoma in non-operative regions after the removal of huge tumors from cerebellopontine angle region.
文中着重研究移动事务的并发控制机制，提出了一种基于动态计时器机制的并发控制策略。
The paper focused on concurrency control mechanism of mobile transactions and proposed a concurrency control strategy based on dynamic timer.
本文通过引入兼容体和并发体的概念，在DOS环境下实现了一种单进程多线索式的并发机制。
By introducing the concepts of compatible object and concurrent object, one kind of concurrent mechanism of single-process but multithread under DOS circumstances is implemented in this paper.
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