为什么鸭子的叫声没有回音

英国Salford大学的科歼侍学家作过试验研究，证实了鸭子回音的存在。只是回音太小肢改中人们通常听不到罢了。

科学家认为，过去人们认为鸭子的叫声没历山有回声的原因有三：
（1）鸭子的叫声不够吵，以至于您对于非常弱的回应没有感觉，认为它没有回音。
（2）产生回音需要大的反射面，而且鸭子要靠近这样的反射面，而这样的条件在通常的情况下不容易同时存在。
（3）鸭子叫声的回音到达您所在的位置时已经因距离而削弱很多，所以您听不到。

叫的太小声。。。。

因为别的鸭子抢着回了。

它没有大鼻孔……

"A duck's quack doesn't echo" is a much-quoted scientific myth. The truth is that a duck's quack does, in fact, echo; however, it may be difficult to hear. This myth was first debunked by the Acoustics Research Centre at the University of Salford in 2003 as part of the British Association's Festival of Science. It was also featured in one of the earlier episodes of the popular Discovery Channel television show MythBusters. The actual reason for the myth is that a quack is a quiet and fading sound which produces faint echoes.
无聊蛋疼在维基百科查得，居然还真有厅巧好，没宽滚有回音只是传说，事实上扮铅还是有的

我也布吉岛。