Callsign
n. 通信呼号
🗣️ 情景例句
Eating salad is good for your health.
多吃色拉（蔬菜）对你的健康有益。
What does he have that I don't?
他有什么地方比我好？
But you still haven't explained what you're doing here.
啊，你还没有说你是来干什么的。