So, for example, we were talking about a threshold frequency as in a minimum frequency of light that you need in order to eject an electron from a metal surface.
举个例子来说，我们谈论的临界频率是，光从金属表面逐出一个电子，所需的最小频率。
When we say "frequency transform" or talk about "representing frequency" we are usually talking about the Fourier transform, implemented as the DFT, or discrete Fourier transform.
当我们说“频率变换”或者说“代表频率”是我们通常所说的傅里叶变换，如离散傅里叶变换dft实现，或。
When we say "frequency transform" or talk about "representing frequency" we are usually talking about the Fourier transform, implemented as the DFT, or discrete Fourier transform.
当我们说“频率变换”或者说“代表频率”是我们通常所说的傅里叶变换，如离散傅里叶变换dft实现，或。
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