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。
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。
First produced in a lab back in 2004, graphene is essentially a single layer of pure carbon atoms bonded together in a honeycomb lattice so thin it's actually considered two-dimensional.
石墨烯最早在2004年诞生于一个实验室，本质上是一层由纯碳原子组成的蜂窝状晶格层，薄到竟被认为是二维物质。
The major advantage of following this two-layer strategy is its inherent flexibility.
遵循这个两层策略的主要优势就在于其固有的灵活性。
This series of articles has explained how to analyze dynamic business workflows in a two-layer model.
本系列文章阐述了如何用一个两层的模型分析动态业务工作流程。
I've presented a two-layer model to analyze dynamic business workflows and also discussed all the major components of a configurable workflow application.
我提供了一个两层的模型来分析静态业务工作流程，并且论述了一个可配置的工作流程应用程序的所有主要组件。
Then, I'll present a two-layer model for building flexible workflow solutions.
然后，我将提供一个用于构建灵活的工作流程解决方案的两层模型。
Today's keyboards mount mechanical keys over electric sensors, most often a two-layer membrane with a suspension layer in between.
如今的键盘机械按键之下装着电子感应器，大部分情况下该感应器是夹有一个悬浮层的两层薄膜。
Knife: there are two layer slide (medium and small skateboarding), bed saddle and knife body together.
刀架：有两层滑板(中、小滑板)、床鞍与刀架体共同组成。
Note the two-layer partitioning system in OpenBSD: the first step sets up traditional fdisk-viewable partitions, while the second disklabel step sets OpenBSD sub-partitions.
注意OpenBSD中的两层分区系统：第一步是建立传统的fdisk可视分区，而第二个disklabel步骤将设置OpenBS d子分区。
Note the two-layer partitioning system in OpenBSD.
请注意OpenBSD中的两层分区系统。
A two-layer model for business workflows.
业务工作流程的一个两层模型。
The dynamic nature of business workflows can be analyzed in a two-layer model, as shown in the layered hierarchy in Figure 1.
业务工作流程的动态本质可以在一个两层的模型中进行分析，如图1中的分层结构所示。
They do not allow two-layer routing and have no channels, so you cannot use a channel-based router.
他们不允许两层布线并且没有通道，因此你不能用一个基于通道的布线器。
The initial attempt is to try to reduce the volume of the building, we hope to make the volume of kindergarten as low as possible, looking like two-layer or even one layer.
最初的意图是要尝试减少建筑的体量，我们希望将幼儿园的体量做到尽可能小，使它看起来就像两层或者一层。
These designs are usually two-layer designs.
这种设计通常是两层的。
A two-layer parallel optical interconnection network with rotary joint function was designed.
设计一个具有旋转连接功能的双层并行光互连网络。
By organizing data block partition, two layer nested bintree were built.
在数据分块组织的基础上构建了两层嵌套二叉树。
A two-layer parallel optical interconnection network with expansibility is designed in this paper.
本文设计一种具有可扩展性的双层并行光互连网络。
A two-layer parallel optical interconnection network with expansibility was designed.
本文设计一种具有可扩展性的双层并行光互连网络。
The Stanford team have called this two-layer process "photonic radiative cooling".
它的发明者们管这种双层降温过程叫“光子辐射制冷”。
The features, applications and electromagnetic computing method of single and two layer winding were introduced.
介绍了单双层绕组的特点、应用情况及电磁计算的方法。
Alkali foaming process for two layer print was introduced to resolve the problem during the process.
总结了双层布印花轧碱起泡相应的生产工艺，解决了轧碱起泡的问题。
By using the VIP simulator and a two-layer model, for the first time, the numerical reservoir simulation for the cyclic flooding have been studied.
利用VIP模拟器和两层地质模型首次进行了周期注水的油藏数值模拟研究。
The random permeation model and the numerical answer of soft soil two-layer are established.
提出了软土二元结构随机渗流模型及其数值解法。
This paper presents a power system intelligent PI stabilizer, which consists of two -layer decision unit, distinguishing unit and intelligent PI control unit.
本文提出一种电力系统智能PI稳定器的设计方法，它由两层决策系统、识别环节及智能PI控制环节组成。
The observation of interfacial reaction layer showed that it is a two-layer structure.
对界面反应层的观察表明，反应层分为两层结构。
A novel two-layer interactive multiple model (IMM) tracking algorithm for turn maneuver is proposed.
针对转弯机动目标跟踪，提出了一种两层交互多模型(IMM)跟踪算法。
A novel two-layer interactive multiple model (IMM) tracking algorithm for turn maneuver is proposed.
针对转弯机动目标跟踪，提出了一种两层交互多模型(IMM)跟踪算法。
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