答案是地球运动的动力学，顺便说一下，这也是导致冰河时代的原因。
The answer is the dynamics of earth's motions, the same thing that caused the Ice Age by the way.
"这本书将详细地介绍有关小冰河时期和其它气候变化的研究过程，但是，在我开始之前，让我先介绍一下历史背景。
This book will provide a detailed examination of the Little Ice Age and other climatic shifts, but, before I embark on that, let me provide a historical context.
沿冰川中部而下的灰色条纹被称为中碛，它是由于两条冰河在下坡时汇合在一起而形成的。
The grey stripe down the middle of the glacier is called a medial moraine. It is formed when two glaciers flow into each other and join on their way downhill.
我们必须要知道的是不管怎么说世界已经在没有人为干预的情况下经历过了几次冰河时期。
It must be noted that the world has gotten into and out of several ice ages with no anthropogenic intervention whatsoever.
今天我想探讨一下地球上最后的一次气候大改变，冰河时期的最后阶段。
Today I want to talk about the earth last major climate shift at the end of the last Iceage.
今天我想探讨一下地球上最后的一次气候大改变，冰河时期的最后阶段。
Today I want to talk about the earth last major climate shift at the end of the last Iceage.
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