Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
What are you talking about?
你在说什么呀？
Do you have any comment on this clause.
你对这一条款有何看法？
A day may begin well enough, but suddenly everything seems to get out of control.
一天开始时，可能还不错，但突然间似乎一切都失去了控制。