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。

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They walked along a dry riverbed.

他们沿着干涸的河床走。

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We reached a dry riverbed and the car stopped. “They’re going to kill us, ” Tahir whispered.

正当我陷入无尽的自责和懊悔时，车驶到一处干涸的河床里突然停了下来，“他们要杀我们了”，塔赫尔在我耳边悄声说道，“完了，他们肯定打算在这儿杀死我们了！

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This dry riverbed marks the invisible boundary beyond which she can't safely go.

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We set out on our own during the late afternoon, ambling through yet another dry riverbed, and wound up at the top of a windswept peak at sunset: Lemarti and Boniface building a fire, Trzebinski embracing and whispering to her young daughter, Tacha, relaxed conversation, aperitifs on offer--and a communal sense of wonder.

FORBES: Escapes