Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
Very! Hey, she forgot her bag!
非常！ 嘿 她忘了她的旅行包！
Humility often gains more than pride.
谦逊往往比骄傲受益更多。
Are you all in the same school?
你们在同一个学校吗？