The new conference room has a terrible echo, so we ordered acoustic panels.

新會議室的回音很嚴重，所以我們訂購了吸音板。

Callers complained about an echo on the line during the customer service call.

來電客戶抱怨客服通話時線路上有回音。

Our tour guide clapped once to show the famous echo inside the cathedral.

我們的導遊拍了一下手，示範大教堂裡著名的回聲。