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地球物理学家正在用越来越灵敏的地震手段对地球表面之下进行持续不断的探索。但是这颗行星的内部深处仍然是它最遥远的前沿领域。所以,当一个地震学家小组上周宣称地球固态铁质内核比这颗行星其他部分旋转得快、
Geophysicists are using ever more agile seismic means to continually explore beneath the surface of the earth. But the inner depths of the planet remain the most distant frontier. So when a group of seismologists announced last week that the Earth’s solid iron core was spinning faster than the rest of the planet,