In our case, we have found the true acoustic echo beacon.(在我们的例子中，我们找到了真正的声学回声信标。)
The father explains, "People call this ECHO, but really this is life."(父亲解释说：“人们称这为‘回音'，但实际上这就是人生。”)
I read that concert halls designed for symphony orchestras have too much echo for jazz music.(我听说，为交响乐团设计的音乐厅里有太多爵士乐的回音。)
He is an echo of his master.(他是主人的应声虫。)
His words were an echo of what she had heard many times before.(他的话是她多次听到过的话的重复。)
By hanging panels of sound absorbing felt on the walls, Sabine reduced the echo enough to make the hall usable.(通过在墙上悬挂吸音板，Sabine减少了足够的回声，使大厅可用。)
The girl let out a giggle that seemed to echo, and she ran away.(那女孩发出一声似乎是回声的咯咯笑声，然后跑开了。)
We shouted in the valley, and in an instant the echo came from the hillside with great distinctness.(我们在山谷中高呼，回声霎时间就从山腰上清晰地返回。)
So, the echoes from a tree are going to a mass of chaotic acoustic reflections, not like the echo from a moth.(所以，树的回声会是一团混乱的声波反射，而不像飞蛾的回声那样。)
The data he compiled yielded a mathematical formula for the relationship between a room's echo duration, its quantity and quality of sound-absorbing materials, and its spatial volume.(他收集的数据得出了一个关于房间回声持续时间、吸音材料的数量和质量以及空间体积之间关系的数学公式。)
