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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The role could span all web systems in portal. It was a token-based and dynamic-activated access control model, which could dynamically adjust the access rights according to user access requirement.

该模型是一个动态激活的模型，根据用户实际的访问需求动态激活相应角色，为用户管理和访问控制管理提供了一个新的解决方案。

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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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