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有生活经验的人买热水瓶或热水瓶胆时,总是要打开瓶盖,将耳杂贴到瓶口“听”,认为听到响声较大的质量好,响声较小的质量差,这是什么道理呢?
When a person with life experience buys a hot water bottle or a hot water bottle, he always opens the bottle cap and sticks the ear miscellaneous to the bottle mouth. He thinks that the loud sound is louder and the sound quality is lower. What is this? Reason?