This paper probes into space-time issue of education technology in history at first, further analyses some time issue and spaceissue of educational technology respectively.
文章首先探讨了历史上教育技术的时空问题，然后分别分析了教育技术学若干时间问题和空间问题；
Thus, although it may seem a trivial issue, it is really quite important, even now, to have efficiency in both space and time.
对于时间以及空间的效率问题，尽管看起来是一个琐碎的问题，但它真的非常所重要。
The merging of 3 D seismic data can be looked as the issue of optimum in different scale space mathematically, the key is how to realize the time variant merging.
三维地震资料拼接可看作是一个不同尺度空间的数学寻优问题，其关键在于如何实现时变拼接。
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