Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
but I have work to do.
但我有工作要做。
I'm ashamed. I couldn't tell you my love.
我真的不好意思,爱你在心口难开呀。
Some of the things were hundreds of years old.
展出的一些东西已有数百年的历史了。