然而，兰皮诺和其他人对传统主义者的一个基本假设提出了质疑：在整个地球历史中，冰川期是周期性发生的。
Yet Rampino and others question one of the traditionalists' basic assumption: the periodic occurrence of glaciation throughout Earth's history.
即使在没有冰川的时期，天文周期也会对地球的气候产生影响。
Astronomical cycles have an effect on Earth's climate even during periods when there is no glaciation.
这一周期约90%的时间为冰川时代，在那期间，我们北半球大部分覆盖着厚达数英里的冰层。
During glacial ages that exist about 90% of the time, our Northern Hemisphere is mostly covered with ice up to several miles thick.
有证据显示说，冰川的进与退都是周期性的，受地球轨道的变化所诱导。
There is some evidence that the ice came and went in regular cycles, driven by changes in Earth's orbit.
通过建立气温周期性升高的数学模式，假设不同的升温情景，对长江流域冰川系统在不同气温变化情景下的变化作了预测。
This article attempts to establish a mathematical model to simulate the glacier system response to periodical temperature increase, taking the Yangtze valley glacier system as an example.
通过建立气温周期性升高的数学模式，假设不同的升温情景，对长江流域冰川系统在不同气温变化情景下的变化作了预测。
This article attempts to establish a mathematical model to simulate the glacier system response to periodical temperature increase, taking the Yangtze valley glacier system as an example.
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