Zf
abbr. 零频率（Zero Frequency）
🗣️ 情景例句
Did you see the washcloth
你看见浴巾
A clear conscience is a sure card.
光明磊落，胜券在握。
He saved money for years and in 1958 he bought a small workshop of his own.
他靠多年积蓄，于1958年买下了自己的一个小铺子。