目前河床十分干燥。
它们在河床上挖巢产卵。
水通过外流河、渗透进河床以及蒸发离开湖泊。
Water leaves a lake via outflowing rivers, by soaking into the bed of the lake, and by evaporation.
它们留下了河床或盆地，形成了我们今天仍然可以看到的石灰岩地层。
They left behind their beds or basins as limestone formations that we can still see today.
大多数沙漠河床通常是干燥的，但它们偶尔也会有大量的水流和沉积物。
Most desert streambeds are normally dry, but they occasionally receive large flows of water and sediment.
它们与地球上的河流系统非常相似，地质学家认为它们是早已消失的河流留下的干涸的河床。
They bear a strong resemblance to river systems on Earth, and geologists think that they are dried-up beds of long-gone rivers.
地下水通常聚集在河流流域，但在干旱地区，地下水也可能完全保留在干涸河床的表面之下。
Groundwater commonly collects in stream drainages but may remain entirely beneath the surface of dry stream-beds in arid regions.
在气候特别湿润的年月里，平常干涸的河床下游可能会有水流动，因为地下水在那里位抬升到了地表以上。
In particularly wet years, short stretches of an otherwise dry stream-bed may have flowing water because the water table rises to intersect the land surface.
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。
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.
这条河在这里流入狭窄的河床。
这就在河床上形成了深水池，使水流变慢。
This creates deep pools in the riverbed and slows the water down.
Parpal dumplin首次发现于一个叫做克罗默浅滩白垩质河床的地方，它的发现是一个叫做“海洋研究”项目的一部分。
Parpal dumplin was first discovered in a place called the Cromer Shoal Chalk Beds as part of a project called Seasearch.
由于河流冲刷和河床加积，沉积层多饱和多孔。
As a result of fluvial scouring and aggrading the riverbed, the alluvial layer is fluid-saturated porous medium.
我们常常发现这些骨骼陷在河床里。
这对河床来说是一个未知的世界。
盛夏时节，河床干涸了。
然而，河床网不是一个孤立的基础设施。
However the riverbed mesh is not an isolated infrastructure.
漫游在河床，无数的后裔。
然而今天大部分钻石不是在河床里找到的。
艾尔湖破裂的河床，恰似月球表面的景象。
The cracked bed of Lake Eyre, meantime, resembles nothing so much as a lunar landscape.
一些季节性小河流留下了有自然粘土的河床。
Small seasonal rivers formed beds of natural clays and dried mud.
河床渐渐干枯：黄河每年只有几周时间不断流。
Rivers are drying up: the Yellow river now flows to the sea for only a few weeks a year.
当他为河床效力时球迷把他当做偶像。
He was idolised by River's supporters when he played for club.
攻击型中场，18岁，河床。
本赛季伊始，他被提升至河床的一线队。
He made his first-team breakthrough at River Plate earlier this season.
人们这还是有生以来第一次见识到河床也被晒干了。
People are seeing riverbeds dry for the first time in their lives.
可是，今天绝大多数的钻石都不是在河床上找到的；
而现在，干涸的河床布满凹坑，处处是裂缝和孔洞。
Now the barren river bed is pitted with cracks and subsidence holes.
而现在，干涸的河床布满凹坑，处处是裂缝和孔洞。
Now the barren river bed is pitted with cracks and subsidence holes.
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