每日背诵第二期78
A similar, but quieter effect can be heard by using an empty cup or even just by cupping a hand over an ear. One popular explanation is that the sound of blood rushing through the ear's blood vessels echoes inside the cup. This is unlikely, because the sound ought to be louder after vigorous exercise, yet it remains at the same level.
把一个空杯子或只是将手合成杯状贴近耳朵，就可以听到类似但比较小的声音效果。一个比较普遍的解释认为这是血液在耳朵血管里流动的声音在杯中回荡不已引起的效果。这说法是不可能的。因为照这样的解释，人在剧烈运动后听到的声音应该会更大，但事实上仍然维持相同的音量。
(短文节选,本篇始于：贝壳传来海洋之音)
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