Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
My favorite type of exercise is ...
我最喜欢的锻炼方式是……。
I agree. I wish it were cheaper.
是这肃，我真希望它能便宜点。
I agree. Which museum would you like to visit?
我同意。你想参观哪个博物馆呢？