The system level error includes syntactical error, null pointer exception, web service timeout, database connection timeout, and so on.

系统级错误包括语法错误、空指针异常、web服务超时、数据库连接超时等。

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From the syntactical point of view, the concept of the syntactic truth degree of formulas is proposed in two-valued propositional logic system.

本文从语构理论入手，在经典二值命题逻辑系统中给出公式的语构真度的概念，从两个不同的角度给出语构真度的等价刻画。

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