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。
The mixtures are proportioned for maximum density and to produce the required "fine grained texture similar to natural stone with no bug-holes permitted."
控制配料比例，使配合物获得最大的密度，并且要求生产出的产品类似天然石料，没孔洞缺陷。
Grained tile is Stone metal tile a grain type, show the beauty of harmony, the perfect fusion of buildings and nature.
木纹瓦是一种木纹型的彩石金属瓦，展现和谐之美，使得建筑与自然的完美融合。
Grained tile is Stone metal tile a grain type, show the beauty of harmony, the perfect fusion of buildings and nature.
木纹瓦是一种木纹型的彩石金属瓦，展现和谐之美，使得建筑与自然的完美融合。
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