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。
The nutrients are deep down in the active layer anyway, not high up near the surface, which is the part of the active layer most affected by run-off.
不管怎样，营养物质存在于活性层深处而不是在表层附近，活性层受径流影响最大的地方。
Because of the cold temperatures, the tundra has two layers: top layer, which is called the active layer, is frozen in the winter and spring, but thaws in the summer.
由于寒冷的气温，冻土带有两层：最上面的一层被称为活动层，在冬季和春季被冻结，但在夏季解冻。
An active layer is highlighted in the view.
激活的层会在视图中强调显示。
Select the "sparkles" layer so that it is the active layer.
选择“火花”层，以便它是活动层。
Changes of shallow layer ground temperature can indicate the changes in active layer thickness.
浅层土壤温度的变化可以指示活动层厚度变化。
These devices have optical waveguide structure, moderate doping level and active layer thickness.
该器件带有光波导结构并具有适当掺杂和有源层厚度。
The dual polarization dual wavelength lasers with active layer of mixed strained layer quantum well are reported in this paper.
本文报道了以混合应变量子阱结构为有源区的激光器。
Seasonal stable snow cover has significant influence on the temperature regime of frozen ground and the variation in the active layer.
季节性稳定积雪对冻土的温度状况和活动层的变化有重要影响。
The following results are discovered: 1) In this area, its active layer has a different geotemperature oscillatory period at different depths and different time scales.
发现：1、活动层不同深度的地温具有不同时间尺度的振荡周期。
The following results are discovered: 1) In this area, its active layer has a different geotemperature oscillatory period at different depths and different time scales.
发现：1、活动层不同深度的地温具有不同时间尺度的振荡周期。
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