现在，乌克兰物理学家又向前前进了一步，他们成功地拍下了单个碳原子的电子云图片。

Ukrainian physicists have gone one step further and managed to take a picture of a single Carbon atom's electron cloud.

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平原的图片画廊。一辆蒸汽火车轧轧声向前进越过广阔的南美洲的巴塔哥尼亚地区。

Photo Gallery: Plains a steam locomotive chugs across an expanse of South America's storied Patagonia region.

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阿拉斯加图片。骑车通过软泥，三人一组骑山地自行车的成员努力向前推进横过崎岖的阿拉斯加山脉。

Riding through slush, members of a team of three cyclists press on in their effort to traverse the rugged Alaska Range by mountain bike.

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