有几种假说，包括地球变暖或变冷，季节波动或洋流的变化，以及大陆位置的变化。
There are several hypotheses, including warming or cooling of Earth, changes in seasonal fluctuations or ocean currents, and changing positions of the continents.
当用户点击一个选项卡到另一个选项卡时，标签应该出现在同一位置。
Tabs should appear in the same location as the user clicks from one tab to another.
这是一个全球性的记录：在取自不同大陆位置的沉积标本中，同位素比率的变化非常小。
It is a global record: there is remarkably little variation in isotope ratios in sedimentary specimens taken from different continental locations.
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