挑战 如何制备20-100nm厚、没有人为假象的 “透明”样品？ Providing adequate facilities are available,there is no real barrier to the preparation of good,thin- film specimens from any engineering material, and no excuse whatsoever for wasting time on the examination of a poor specimen in the microscope. -From David Brandon and Wayne D.Kaplan,Microstructural characterization of materials 4挑战 如何制备20-100nm厚、没有人为假象的 “透明”样品？ 4