Ringback
回铃声（电话服务）；有回铃音的电话
🗣️ 情景例句
What do you think? Does it look promising?
你怎么想？ 希望大吗？
I have due cause to do so.
我有充分的理由这么做。
I often fish for hours without catching anything.
我经常一钓数小时却一无所获，