Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
Well, do we have a date?
怎样 ，我们算是约定了吗？
Don't underestimate me.
别小看我。
The other was much farther away from the hive.
另一个远离蜂箱。