研究者们顺理成章地得出这样一个结论：当黑板被挂擦时，该声响在我们的耳内放大，加剧了痛苦。
What seems to happen, the researchers reckon, is that when a screech on a chalkboard is generated, the sound is amplified within our ears to painful effect.
但有趣的是，移去了这些令人讨厌的声响，刮擦声也产生了一点点变化。
But, interestingly, removing the noisy, scraping part of the sound made little difference.
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