Zf
abbr. 零频率（Zero Frequency）
🗣️ 情景例句
I'll need a few minutes to check over my notes again.
我再需要几分钟来核对一下我的笔记。
Is the source of the information reliable?
那个消息的来源可靠吗？
Let 's see, that means a 2% discount if paid within ten days.
哦。那是说如果10天内付款，有2%的折扣。