Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
Would you mind-giving me that-red-book?
能把那本红色的书递给我吗？
Playing with fire!
找死！
Mum, can we have our fish and chips outside?
妈，我们可以在户外吃吗？