Language is negative carrier of culture, without language, culture without load, without culture, language is nothing but a vacant shell.

语言是文化的负载体，没有语言，文化无以负载，没有文化，语言也就是一个空壳。

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Then we detect and estimate the carrier frequency of negative SNR DS-SS Signal have done. Theoretic analysis and simulation prove the validity of the arithmetic.

理论分析和仿真实验证明，在负信噪比条件下该方法可有效提高对DS-SS信号载波的检测能力。

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The spectrum of amplitude modulated signal are two half magnitude spectrums of base band signal positive and negative shifted by a carrier or R. F. frequency.

调幅讯号之频谱为一半强度基频讯号之频谱分别正负位移一射频或载波之频率。

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