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如果你能到地心旅行,你是否想过在那里会有什么发现?加州理工学院的地球物理学家David Steven-son说,总有一天,我们会得到答案。Stevenson想到一种将探测器送到地核的方法,目
If you can travel to the heart of the earth, have you ever thought about what will be found there? The geophysicist David Steven-son of Caltech said that one day we will get the answer. Stevenson thought of a method of sending the detector to the core.