回声

例句：

1. 1. The sound of the waves echoing off the shore is soothing.
   海浪拍打岸边的声音令人感到宁静。
2. 2. The teacher's words echoed in the classroom.
   老师的话在教室里回荡。
3. 3. The story of the explorer echoes through history.
   探险家的故事穿越历史长河。