单词：null part
[数] 零部分
null part的用法和样例：
例句
- In communications, an amplitude modulated signal in which the amplitude of the carrier is reduced to zero for some part of the cycle of the modulating waveform.通信技术中的一种调幅信号，其载波的振幅在调制波形周期的某些部分减少到零。
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