Check constraints are constraints on table columns that are used to restrict the user to a particular check condition.

检查限制是表的列上的限制，用于将用户限制到特定的检查条件。

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The realization of teaching needs to meet the idea and realizing the condition, material guarantee condition, ability condition of the subject and norm restrict the terms etc.

教学的实现需要满足观念认识条件、物质保障条件、主体能力条件和规范制约条件等。

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TCP/IP has chosen to restrict the scale factor due to a network condition. This could be related to a problem in a network device and will cause degraded throughput.

翻译成中文大概就是：由于网络状况TCP/IP选择限制比例因子。 这个问题可能和一个网络设备有关并且会降低网络流量。

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When granting planning permission, Lewes District Council added a condition to restrict lorry movements to between 07:00 BST and 19:00 BST Mondays to Fridays, excluding bank holidays, and from 07:00 to 15:00 on Saturdays.

BBC: Norman Baker