Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
My favorite food is pork chops.
我最喜欢的食物是小猪排。
Do you have some change?
你有零钱吗？
Yes, thank you. We enjoyed ourselves very much.
挺好，谢谢你。我们玩得非常愉快。