1·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。
2·Samburu man leads his cattle out of the village and across a swath of arid land toward a water well dug into a desiccated Kenyan riverbed.
一位桑布鲁男子赶着牛群走出村落，穿过一片干燥的土地，朝着在干燥河床上挖掘的一口水井进发。
3·The imprint is well defined and deeply embedded in the sandstone riverbed, as if the tyrannosaur had walked there only last week.
这些足迹仍非常清晰，而且深陷在砂岩河床上，似乎这只霸王龙上个星期才刚走过一样。
4·They followed the Black Hawks' initial flight path but landed at a predetermined point on a dry riverbed in a wide unpopulated valley in northwest Pakistan.
他们使用了黑鹰的出事航线但降落在巴基斯坦西北部一处宽阔的无人居住山谷的干河床上，这个地点是预先指定的。
5·A Samburu man leads his cattle out of the village and across a swath of arid land toward a water well dug into a desiccated Kenyan riverbed.
一位桑布鲁男子赶着牛群走出村落，穿过一片干燥的土地，朝着在干燥河床上挖掘的一口水井进发。