a dry riverbed 干涸的河床
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。
They walked along a dry riverbed.
他们沿着干涸的河床走。
The dry riverbed finds no thanks for its past.
干河床对它的过去不怀谢意。
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