The performance of Direct Sequence Spread Spectrum(DSSS) in severe pulsed noise interference will be badly degraded when the duty factor is small.

当脉冲干扰占空比较小时，干扰能量集中，导致直接序列扩频（DSSS）系统的误码性能较差。

youdao

He headed a group of engineers, whose duty was to develop frequency synthesizers and local generators for frequency hopping spread spectrum and satellite systems.

他还带领一个工程师团队，负责研究用于跳频扩频以及卫星系统的频率合成器和局部发生器。

youdao

Like the overwhelming majority of figures in public life across the political spectrum, I entered politics because of a sense of public duty and to improve the lives and opportunities of those less fortunate than me.

BBC: Brown's smear row letters in full