Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
I see. What time will she come back?
哦，那她几点会回来？
I mean what I say.
我说话算数。
He makes it seem as if this is one of the most delicious meals that he has ever enjoyed.
他演得像极了，他吃皮鞋的情景就像他吃过的最可口的一顿饭似的。