So the researchers set up a fire pit and buried a silcrete sample at high temperature.

因此研究者們建立起一個火坑，然后把一個硅結(jié)礫巖樣品埋進(jìn)去先锋影音免费资源站。

The silcrete found at archaeological sites was glossy with a fine grain and a reddish color.

在南非的考古地點(diǎn)發(fā)現(xiàn)的硅結(jié)礫巖很光滑一级大黄片操逼的，帶有細(xì)致的顆粒，呈紅顏色国产专区在线操。

About 72,000 years ago, our ancestors along coastal South Africa made tools from silcrete, a cement-like layer of soil.

大約7萬2千年以前国产香蕉网址在线观看AV，在南非的沿海地帶，我們的祖先用硅結(jié)礫巖制造石頭工具黄色视频免费播放。

Then a colleague from Arizona State University remarked that a piece of silcrete reminded him of heat-treated tools in the Southwest.

隨后一名來自亞利桑那州立大學(xué)的同事說欧美视频.欧美性爱，硅結(jié)礫巖使他想起了南非西南部地區(qū)的熱處理過的石器。