Zf
abbr. 零频率（Zero Frequency）
🗣️ 情景例句
Now let's discuss the terms of payment.
现在来讨论付款条件。
Wouldn't you like some coffee?
你想要一些咖啡吗？
the waters flow more quietly, and in the end, without any visible break,
河水流得平缓起来，最后连绵不断地