Ringback
回铃声（电话服务）；有回铃音的电话
🗣️ 情景例句
Robots can be used for many tasks which are considered too dangerous for people to do.
机器人能完成许多对人类来说是很危险的任务。
She wants me to come as often as possible.
她希望我尽可能常来。
Thanks a lot. Bye.
谢谢你。再见。