Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago.
科学家们已经确定，在埃塞俄比亚阿法尔地区干燥河床的细颗粒沉积物中发现的具有锋利边缘的石片存在于252万至260万年前。
People often assume that those flakes must mean that the scalp is too dry and that, like skin that's flaking, it must obviously need more moisture to make it look better.
人们通常认为头屑意味着头皮或皮肤太干，需要补充水分来使它更好。
If you have a dry scalp most of the flakes will have disappeared.
如果你是干性头皮，那么大多数薄片便会消失。
If you have a dry scalp most of the flakes will have disappeared.
如果你是干性头皮，那么大多数薄片便会消失。
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