像犀牛角，其主要成分是角质，与人的毛发和指甲一样富含纤维蛋白质。不过，有些地区的人还认为犀牛角可以壮阳。
Rhino horns, for example, are mostly made of keratin, the same fibrous protein found in human hair and fingernails, but people in some cultures still think of them as an aphrodisiac.
像指甲在黑板上划过的声音、牙医钻牙的声音，警报等等。
So like fingernails scratching on a chalkboard, dentist drills, sirens.
我打量着她精修细剪的指甲和时尚前卫的衣服，心里想到：不管她打扮多么考究，做了母亲后，她会变得像护崽的母熊那样原始而不修边幅。
I look at her carefully manicured7 nails and stylish suit and think that no matter how sophisticated8 she is, becoming a mother will reduce her to the primitive9 level of a bear protecting her cub10.
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