Echoranging
回声测距法
🗣️ 情景例句
Lacks courtesy is ill-mannered.
不礼貌，举止不当。
We can't fly our kites any more because the wind has stopped.
由于风静止，所以已经没法放风筝了。
We're sorry, but we 've had a slight price increase here.
真抱歉，不过我们出只涨了一点点而已。