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Topological insulators are a prime example of how theoretical predictions can lead to experimental discoveries that reshape our understanding of the physical world.
The Ethiopians say that their gods are snub-nosed and black, the Thracians that theirs have light blue eyes and red hair.
不只是国家有染的问题,对士而言也有受到熏染的问题。 
当你想要放弃的时候,想想你当初为什么坚持了这么久。