This paper is mainly a research on time consistence in Distributed Virtual Environment. Some clock synchronizations are introduced in it. Combined with practice, the result is proposed at last.
要做到时空一致，时间一致是关键，本文主要对分布式虚拟环境中时间一致性进行了研究，介绍了几种时间同步的方案，并结合实际应用，给出了实验的结论。
In actual practice, it displays five patterns: learning exploration pattern, autonomous learning pattern, cooperative learning pattern, case teaching pattern and virtual environment pattern.
具体实践中，有探索学习模式、自主学习模式、协同学习模式、案例教学模式和虚拟环境模式等五种模式。
For the reference usefulness, I provide ten principles in designing Virtual Environment system for cultivating spatial ability of the kalends according the literatures of theory or practice.
同时本文综合理论和实践的研究，给出了用于培养初中生空间能力的虚拟环境系统设计的十大原则，以期对虚拟现实技术的教育应用提供一定的参考。
In a virtual environment, it is safe and possible to produce and practice the crane operations in conditions and situations that might be rare or not normally be possible at all.
在一个虚拟的环境，它是平安的，有能够发生与实践条件和状况下，起重机操作能够是稀有的或不正常状况有能够的话。
In a virtual environment, it is safe and possible to produce and practice the crane operations in conditions and situations that might be rare or not normally be possible at all.
在一个虚拟的环境，它是平安的，有能够发生与实践条件和状况下，起重机操作能够是稀有的或不正常状况有能够的话。
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