The stone steps, dating back to 1855, are beginning to wear.

这些可以追溯到1855年的石阶开始出现磨损。

《柯林斯英汉双解大词典》

Occasionally one can determine whether stone tools were used in the right hand or the left, and it is even possible to assess how far back this feature can be traced.

偶尔，人们可以确定石器是用在右手还是左手上，甚至可以评估这种特征可以追溯到多远以前。

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He believes that as far back as 30,000 B.C., hunters may have used a system of notation, engraved on bone and stone, to mark phases of the Moon.

他认为，远在公元前30,000年以前，猎人可能会用一套刻在骨头和石头上的符号系统来标记月相。

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Contrary to images of "going back to the Stone Age, " this form of energy efficiency actually increases the levels of illumination (and thus literacy), while trimming greenhouse gas emissions, indoor air pollution and energy bills that mire the poor in poverty.

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In the cottage downstairs there was only one room, with a kitchen at one end and a sitting room at the other, a flagged floor and a wood fire smoldering in a wide stone hearth, one wall stripped back to the naked stone.

NEWYORKER: She��s the One

At first, employers were wary, presuming that her consulting business was failing or that she just wanted to use a job as a stepping stone to head back to her own business.

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