Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
I appreciate your consideration.
我很感激你的体贴。
I can't help but be astonished by that acrobat.
我不能不为那杂技演员的表演而深为惊讶。
I'm sure that you need an X-ray, Andy.
我看你需要做一次X光透视。