In some web systems there is an IP address check for some purposes.

在某些网站系统有一些目的IP地址检查。

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You have these big iron legacy systems that have to be joined with web systems.

这些大型的传统系统必须与网络系统相结合。

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Mobile devices have technical limitations and user experience requirements not present in desktop or web systems.

移动设备在技巧上有着限制和用户体验需求不合于当前的桌面电脑和收集体系。

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You can take a problem that might be relatively intuitive to solve but when you scale this thing up as is increasingly the case in the web, in large data systems, and so forth, you actually have to now think smart, you actually have to think efficiently and you have to solve this problem effectively.

你可以把一个问题用比较直观的方法解决,但如果你把此类问题的数量增大,正如越来越多的互联网，和大规模数据系统中出现的问题等等,你应该考虑怎样才能更简便，怎样才能更高效,你应该用行之有效的方法处理问题。

哈佛公开课 - 计算机科学课程节选

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