The fine structure constant, and other fundamental constants, are absolutely central to our current theory of physics.

微细构造常数和其他基本常数都无疑是我们现在研究的核心。

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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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The current at the channel base is specified, and use two time constants can get the much better shapes than single time constant.

模型对于特定的雷电通道底部电流，采用了汉时间常数，取得了比单时间常数更好的拟合效果。

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