Sfsu
abbr. signal frequency signaling unit 信号频率信令单元
🗣️ 情景例句
Is that all right with everyone?
各位有意见吗？
He hears a nice tune. Now, he is listening to it.
他听到了美妙的旋律。现在，他在倾耳聆听。
Yes?
什么事？