Standard constants and tools for placing an object within a potentially larger container.

用于在可能更大的容器中放置对象的标准常量和工具。

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The linear relationship between the gas phase standard enthalpies of formation and the substituent constants is discussed.

讨论了气态摩尔标准生成焓与取代基常数间的线性关系。

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For functions and constants, if the current namespace does not contain that function or constant, PHP's fallback mechanism will fall back to the standard PHP function.

对于函数和常量，如果当前的名称空间不包含这个函数或常量，PHP的后退机制会后退到标准的php函数。

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