Zf
abbr. 零频率（Zero Frequency）
🗣️ 情景例句
Reading childern's literature is an excellent way for the beginning English speaker to improve.
对于刚刚开始学说英语的人，阅读儿童文学读物是个不错的方法。
She had a headache, because of the weather here.
由于这里的天气原因她感到有些头疼。
He thought they needed to know the direction to it.
它们还需要知道去那里的方向。