The answer may be that virtually all the water on Mars is now locked in the permafrost layer under the surface, with more contained in the planet's polar caps.
答案可能是，现在火星上几乎所有的水都被锁在地表下的永久冻土层中，更多的水被包含在这个星球的极地冰帽中。
Geologists think that this fluidized ejecta crater indicates that a layer of permafrost, or water ice, lies just a few meters under the surface.
地质学家认为，这个具有流体化喷出物的陨石坑表明，在地表下几米深处有一层永久冻土层或水冰。
Beneath this active layer is a second layer called "permafrost", which is frozen all year around, and is impermeable to water.
在这一活跃层下面，是被称为“多年冻土”的第二层，终年冻结，不透水。
There're two reasons for this: first, they live in the active layer, which, remember, contains water that doesn't penetrate the permafrost.
造成这种情况的原因有两个：首先，它们生活在活动层中，请记住，活动层中包含的水不会渗透永久冻土。
On the beach there is a jagged layer of thawing permafrost.
海滩上，有一个不规则的正在融化的永久冻土层。
The priority is to ascertain which kurgans still have a layer of permafrost below them and might therefore be saved.
关键问题是弄清楚哪些库刚下面仍然有着一层冻土因此可以被保存下来。
The closed ballast layer can raise permafrost table, decrease annual mean ground temperature below the ballast layer, and protect the permafrost effectively.
封闭碎石道碴层可以提升冻土上限，降低多年冻土温度，对下部多年冻土起到很好的保护作用。
Much of the basin is made up of permafrost, a layer of frozen soil in Earth's polar regions.
盆地大部分是由永久冻土带构成，是地球的两极地区的冻土层。
Much of the basin is made up of permafrost, a layer of frozen soil in Earth's polar regions.
盆地大部分是由永久冻土带构成，是地球的两极地区的冻土层。
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