Lex takes a specification file and builds a corresponding lexical analyzer, coded in c.

lex可以接受规范文件并构建一个相应的词汇分析器(用c编写的)。

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The frequency pseudocolor-coded speech spectrogram is then obtained by means of a sampling narrow slit placed at Fourier plane in white-light optical spectrum analyzer.

然后在白光光学频谱分析系统中，利用放置在傅里叶频谱面上的取样狭缝得到按频率假彩色编码的频谱图。

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