Backsiphonage
反虹吸
🗣️ 情景例句
I need to confirm my reservation.
我要确认我的预定。
Sorry, She is out. Shall I take a message?
抱歉，她外出了，你要留口信吗？
Another time, possibly, but not Friday.
换个时间还有可能，但不要在星期五。