电话中稍加一点背景噪音，我们的耳朵就听不到电话中的回声。
A bit of background noise on the phone enables our ears to filter out echoes.
在船体外壳上敲打发出的声音会从海底反射。通过测量敲打与接受回声的间隔时间，这一点的海底深度就可计算出来。
A sound made by tapping on the hull of a shop will be reflected from the sea bottom, and depth of the sea at that point can be calculated.
类似球形的囊状回声，囊内充满细小光点。
大自然的声音是上帝的声音，一位艺术家只要在他的创作中运用一点点的回声，也会因他的努力得到很高的奖赏。
Nature's voice is the voice of God, as long as an artist in his creative use of a little bit of echo. will be a high reward for his efforts.
在环极楼的中心点上，用力跺脚或放声呼唤、歌唱，可以听到十分明显的回声，好像北京天坛的回音壁。
Stomping, crying or singing in the center of Huanji Building, you can hear clear echoes, as do in the Echo Wall of Temple of Heaven in Beijing.
在环极楼的中心点上，用力跺脚或放声呼唤、歌唱，可以听到十分明显的回声，好像北京天坛的回音壁。
Stomping, crying or singing in the center of Huanji Building, you can hear clear echoes, as do in the Echo Wall of Temple of Heaven in Beijing.
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