减少网络通讯负载一直是分布式虚拟现实致力解决的问题，本文基于分布式虚拟环境介绍了兴趣管理技术，并提出了多阈值DR技术的思想。

This paper introduces the technology of Interest Management in Distributed Virtual Environment, and issues the technology of multi-threshold DR(Dead Reckon) based on the environment.

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它介绍了Scratch，这种在我们学习过的环境中使用的编程语言，同时也是一些我们将贯穿整个课程的基础知识。

It introduces Scratch, the programming language in an environment we looked at, but also some of the fundamentals that we'll lace throughout the course.

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此外，它还介绍了与自然和谐相处的理念，希望孩子们能够保护野生动物和自然环境。

Besides, it also introduces the idea of getting well with nature, and hopes children can protect wild life and the natural environment.

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itself and introduce Scratch, the programming language in an environment we looked at, but also some of the fundamentals that we'll lace throughout the course.

这周五我们就开始讲计算机科学，并在我们设定的环境下,介绍编程语言Scratch的用法，而且我们也会在课程中,捎带讲一些基础知识。

哈佛公开课 - 计算机科学课程节选