Any have stumbling places can produce echo,but our daily life in can't through have reason often heard:The dissemination speed of the voice is 340 meters/ per second.But person's ear can make twos distinguishing time needed orotund the most short is 0.1.Is also say from your original voice the voice was stop behind of 0.1 then can hear echo after.So say basic condition of hearing the echo be the person is big apart from the stumbling block in or be equal to 17 meters of time,you then can open original voice and echo 2 distinctions,open and spacious house or be apart from a high wall far and Tashan in usually can hear echo,and hear the speed of echo the far near change is along with of the person and the stumbling block but change.But if you are too far apart from because the voice wave scatters you also can hear an original voice
英语翻译任何有障碍的地方都能产生回音,但我们日常生活中却不能经常听到是有原因的:声的传播速度是340米/秒.而人耳能够把
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