科学家应该尽早对指甲之下的暗线进行调查。
Dark lines beneath the nail should be investigated as soon as possible.
据有些科学家声称，犀牛角的效果就如同嚼自己的指甲。
Its effect, some scientists say, is the same as chewing your fingernails.
我们大部分人都忍受不了用指甲刮黑板的声音，现在科学家们对我们无法忍受这种声音并忍不住要捂耳朵的现象有了一种解释。
Most of us can't bear the sound of nails on a chalkboard, but now, researchers have a possible explanation as to why the sound makes us cringe and cover our ears.
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