It was discovered in a dry lake bed.

该石像是在一个干涸的湖床上被发现的。

The fossilized footprints were found in a dry lake in White Sands National Park in 2009.

2009年，人们在白沙国家公园的一个干涸的湖泊中发现了这些足印化石。

So there isn't a solid explanation regarding how they move across the floor of the dry lake bed.

所以关于它们的如何在干燥的湖底移动的，没有可靠的解释。

It could be rainfall, dunes or dry lake beds.

可能是降雨、沙丘或干涸的湖床。

There's tons of evidence for flowing water on the surface long ago, including dry river beds, dry lakes, sedimentary layers, and minerals we know need water to form.

有大量的证据表明火星在很久以前存在流动的水，包括干涸的河床、干涸的湖泊、沉积层，以及一些我们知道必须有水才能形成的矿物质。

The Olorgesailie people disappeared from the scene about 200,000 years ago when the lake dried up and the Rift Valley started to become the hot and challenging place it is today.

奥洛戛萨里人大约在20万年前消失，当时湖泊已经干涸，大裂谷地区开始变得像今天这样炎热和艰苦。