通常，时间约束限制了您在这类应用程序中能够使用的提示信息的数量。

Usually time constraints limit the number of bells and whistles you can apply to such an application.

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这些约束限制了高效的新企业竞争市场份额的能力，纵容现有企业，提高整个经济领域的成本。

Such restrictions limit the ability of efficient newcomers to compete for market share, cosseting incumbents and raising costs across the economy.

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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。

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.

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Some people want to have these to be many and for them to be very binding, others want them to be very few and not very binding, and that's an argument one can get into.

有些人认为惯例更多一些,更有约束力一些,而有些人却认为惯例的限制少一些,这是争论所在

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