Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
No, I'm not.
不，我不觉得。
Well begun is half done.
良好开端，功成一半。
It has been estimated that if the bridge were packed with cars, it would still only be carrying a third of its total capacity.
据估计，若桥上摆满了汽车，也只不过是桥的总承载力的1/3。