Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
Very splendid. How about patent rights?
很不错。它的专利权怎么样呢？
Did you sleep well last night?
你昨晚睡得好吗？
Lily was born ten minutes before me,so she says,I'm older than you! So I must open the present!
“我比你大！应该由我来拆礼物包！”