Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
The girls learned a great deal.
女孩们学到了许多东西。
Can you give me a hand?
你能帮个忙吗？
Li Bai is one of the greatest poets that have ever lived in China.
李白是中国有史以来最伟大的诗人之一。