During glacial periods, the forams' shells contain more of the heavier of two oxygen isotopes, as the lighter one is preferentially accumulated in snow and ice rather than the ocean.
冰河时期海洋中多空虫贝壳化石中积聚的较重的氧同位素比较多，而另一种轻的氧同位素则更多地积聚在古代冰层和积雪中。
The Arctic could be in summer ice-free as soon as 2030 rather than 2100.
可能在不久的2030年，而不是2100年，北极的夏季就会无冰。
When sea ice melts, the newly exposed dark water absorbs radiation rather than reflecting it, as snow or ice would.
当海冰融化时，刚刚暴露出来的水对光线的吸收作用大于反射作用，不像雪或冰那样，对光线更多的是反射作用。
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