And thanks to the Russian data exchange, we learned that the average ice thickness in the Arctic declined by almost half in 28 years.

多亏了俄罗斯的数据交换，我们了解到北极的平均冰厚度在 28 年内下降了近一半。

The skin covering of the skull easily detached, and no hemorrhage was noticeable. 2. The skull bones were of average thickness and uninjured. 3.

1.颅骨外皮易脱落，无明显出血。 2.颅骨厚度适中，无损伤。 3.

The average thickness of the trunk is, perhaps, about ten or twelve inches. The leaves are mostly undivided, like round awls, instead of being separated, like those of other pines, into twos and threes and fives.

树干的平均厚度可能约为十或十二英寸。叶子大多是不分开的，像圆锥一样，而不是像其他松树那样分开成三三两两。

If carbon dioxide is a blanket of average thickness over heating the earth for centuries, methane is like a blanket seven feet thick with over 80 times the heat-trapping power of CO2 for about two decades after its release.

如果二氧化碳是覆盖在地球上加热的毯子，已经持续几个世纪，那么甲烷就像是一条七英尺厚的毯子，在释放后的大约20年内，它捕捉的热量是二氧化碳的80多倍。