Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
Now, what else is on the schedule today?
那么， 今天的工作表上还有些什么?
What's your first name?
你的名字叫什么？
But I don't understand. You returned the necklace to me the next afternoon. I remember very well.
不过，我还不懂。我记得很清楚，你们第二天下午就把项链还给我了。