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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Google has even taken on some of Bing's distinctive look, like giving people the option of a Bing-like colorful background, and the placement of navigation tools on the left-hand side of the page.