Echometry
测回声术
🗣️ 情景例句
That shop sells quality goods.
那家店卖的东西很好。
I subscribed to a lot of periodicals last year.
去年我订了许多期刊。
Before long, the noise dropped completely and the boat began to drift gently across the water.
没过多久，噪音便彻底消失，快艇开始在水面上慢悠悠地漂流。