Echoranging
回声测距法
🗣️ 情景例句
Tomorrow is another day.
有明天就有希望。
If you lose your way, ask a policeman.
如果你迷路了，可以向警察打听。
Tomorrow is christmas Eve, and my father and I went to choose a Christmas tree today.
明天是圣诞节前夜，今天我和父亲去选圣诞树。