Definition: a sound that you hear more than once because you are in a big, empty space Level: C2
我能听到钟声的回音。
I could hear the ___echo of the bell.
你总能听到钟声的回音。
You can always hear the ___echo of a bell.
他声音的回音在空荡的大厅中回荡。
The ___echo of his voice lingered in the empty hall.
