Overall, these restrictions limit the flexibility of relational database systems and, thus, the ability of users of such systems to implement complex, interactive models within the database itself.
总之，种种约束限制了关系数据库系统的灵活性，并因此限制了系统用户在数据库内部实现复杂、交互式模型的能力。
The HOUGH transform circle detection method involves complex computation, and needs to set some restrictions in advance, which have certain limitations for real-time traffic signs detection.
HOUGH变换圆检测法涉及复杂运算量，同时需要预先给定一些限制条件，对于交通标志的实时检测有一定局限性；
They can guard against malicious or incorrect INSERT, UPDATE and DELETE operations and enforce other restrictions that are more complex than those defined with CHECK constraints.
触发器可以预防恶意或错误的INSERT、UPDATE和DELETE操作，并强制执行比CHECK约束中定义的限制更复杂的限制。
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