求翻译：商务信函作为一种正式的书面文体, 其宗旨是明确, 清楚, 具体。但有时为了特定的语用功能, 写作中也要求语言的模糊性, 以使其更趋于得体完善。是什么意思？

Business correspondence as a formal writing style, its purpose is clear, clear and specific. However, ambiguity, and sometimes for specific language features, language also requires writing to become more decent perfect.

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Foreign business letter as a formal written style, its purpose is clear, clear and specific. But sometimes to specific pragmatic functions, also called for the fuzziness of language in writing, to make it more decent improvement.

The commercial correspondence took one kind of official written literary style, its objective is clear about, clear, concrete.But in order to sometimes the specific language uses the function, in writing also requests the language the fuzziness, enable it to tend to the appropriate consummation.