echo ·noun (SOUND)
Definition: a sound that you hear more than once after it hits a surface in a big space Level: C2
教堂钟声敲响后，其回声在山谷中萦绕许久。
The ___echo of the church bell lingered in the valley long after the strike.
在空旷的音乐厅里，即使是低语也能听到清晰的回声。
In the empty concert hall, you can hear a distinct ___echo of even a whispered word.
在洞穴深处，我们的喊声得到了幽灵般的回声的回应，那回声似乎来自四面八方。
Deep within the cavern, our shouts were met by a ghostly ___echo that seemed to come from all directions.