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。

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The ground was strewn with sharp-edged pebbles.

地上铺满了棱角锋利的石子。

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So we're left cast up on the sharp-edged shingly shores of realism.

我们行走在边缘锋利的碎石岸边的现实环境中。

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New, sharp-edged vine leaves emerge from the stone as if they had just grown there.

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He said it was "very rare" that a plant-eater would sport sharp-edged, enlarged canines.

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Since taking over from the sharp-edged Mr Bildt, he has struggled to make an impact.

ECONOMIST: Norway and Sweden