添加回音

例句：

1. 1. The sound of the waves echoed across the beach.
   海浪的声音在沙滩上回荡。
2. 2. The music had a haunting echo in my mind.
   这音乐在我脑海中回响。
3. 3. The crowd's cheers echoed throughout the stadium.
   人群的欢呼声在整个体育场中回响。