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。
That they would live and she would die was an impossibility, as foreign as the idea of snow upon the sharp-edged rocks of the Waste.
他们生与她死的可能性同样不存在，这种念头如荒野锋利的岩石能够落住雪一样荒谬可笑。
Most impressive is the sharp-edged stone over the doorway which is over 3 m (10 ft) long, 2.4 m (8 feet) high and 1.3 m (4 ft) thick.
最令人印象深刻的是门口长3米(10英尺)多、宽2.4米(8英尺)、厚1.3米(4英尺)的锋利的石块。
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