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。
Ci poems, originally lyrics written for songs, have more restrictions on the number of characters, lines as well as tonal styles and are therefore more complex and demanding.
词最初是为乐曲配写的歌词，所以字数、句数、平仄都因曲调的要求比诗更加复杂。
Ci poems, originally lyrics written for songs, have more restrictions on the number of characters, lines as well as tonal styles and are therefore more complex and demanding.
词最初是为乐曲配写的歌词，所以字数、句数、平仄都因曲调的要求比诗更加复杂。
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