Sffd
abbr. step-function frequency discriminator 阶跃函数鉴频器
🗣️ 情景例句
May I use the phone?
我可以用电话吗
He measures another's corn by his own bushel.
用自己的标准衡量别人；以己度人。
Li Lei ran much faster than the other boys.
李磊跑得比其他男孩快得多。