A theoretical model is proposed for calculating the surface prole provoked by back cutting surface marks during face milling.

理论模型，提出了计算表面简介挑起回到切割表面标志着在脸上铣削。

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Some fossil bones with surface marks were uncovered in Bailong Cave, a palaeo-anthropological site of the early stage of Middle Pleistocene.

湖北省郧西县白龙洞古人类遗址属于中更新世早期，发掘出表面带有痕迹的骨化石标本。

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Because the Moon has no atmosphere, its surface is not subject to erosion, so it retains the marks of its early history.

由于月球没有大气层，它的表面不会受到侵蚀，所以它保留了早期历史的痕迹。

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Our people answered his call and rose to the challenge, and today an American flag still marks the surface of the moon.

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Like marks on the surface of a beautiful painting, once you are aware of the imperfections, it is hard to re-enter the illusion of the image.

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The caving crew descends through tight passages hundreds of feet beneath the Earth's surface, guided by the gust of air that marks the cave's primary passage.

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