然而这两个词的使用往往是不严密的。

However the two words are often loosely used.

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时常，建模概念被解释成使用不严密的自然语言。

More often than not, modeling concepts were explained using imprecise and natural language.

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而且那些设计不严密的网站通常使黑客有机可乘，攫取价值连城的数据库。

And poorly designed websites often provide a window into valuable databases.

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